(Main list of acronyms) __NOTOC__ * a – (s)

Atto- A metric prefix is a unit prefix that precedes a basic unit of measure to indicate a multiple or submultiple of the unit. All metric prefixes used today are decadic. Each prefix has a unique symbol that is prepended to any unit symbol. The pre ...

* A – (s)

Ampere The ampere (, ; symbol: A), often Clipping (morphology), shortened to amp,SI supports only the use of symbols and deprecates the use of abbreviations for units. is the unit of electric current in the International System of Units (SI). One amp ...

A0–9

* A1C – Airman First Class *

A2ATD A, or a, is the first letter and the first vowel of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''a'' (pronounced ), plural ''ae ...

or A²ATD – (i) Anti-Armour Advanced Technology Demonstration *

A2C2 A, or a, is the first letter and the first vowel of the Latin alphabet, used in the modern English alphabet, the alphabets of other western European languages and others worldwide. Its name in English is ''a'' (pronounced ), plural ''ae ...

or A²C² – (i) Army Airspace Command and Control * A4 – many, including a European standard office paper size; ''see entry'' * A10 – (i)

Atlantic 10 Conference The Atlantic 10 Conference (A-10) is a collegiate athletic conference whose schools compete in the National Collegiate Athletic Association's (NCAA) Division I. The A-10's member schools are located in states mostly on the United States Easte ...

AA

* aa – (s)

Afar language The Afar language ( aa, Qafaraf, links=no; also known as ’Afar Af, Afaraf, Qafar af) is an Afroasiatic language belonging to the Cushitic branch. It is spoken by the Afar people inhabiting Djibouti, Eritrea and Ethiopia. Classification Afar ...

(ISO 639-1 code) * aA – (s) Attoampere * AA ** (i) achieved availability ** Alcoholics Anonymous ** (s) Armed Forces Americas (postal symbol) ** Aruba (FIPS 10-4 territory code) ** (i) assembly area ** Automobile Association ** avenue of approach **

American Airlines American Airlines is a major US-based airline headquartered in Fort Worth, Texas, within the Dallas–Fort Worth metroplex. It is the largest airline in the world when measured by fleet size, scheduled passengers carried, and revenue passenge ...

Aerolíneas Argentinas Aerolíneas Argentinas, formally Aerolíneas Argentinas S.A., is Argentina's largest airline and the country flag carrier. The airline was created in 1949 from the merger of four companies and started operations in . A consortium led by Iberia ...

AAA AAA, Triple A, or Triple-A is a three-letter initialism or abbreviation which may refer to: Airports * Anaa Airport in French Polynesia (IATA airport code AAA) * Logan County Airport (Illinois) (FAA airport code AAA) Arts, entertainment, and ...

** (i) administration, authorization, and authentication **

American Automobile Association American Automobile Association (AAA – commonly pronounced as "Triple A") is a federation of motor clubs throughout North America. AAA is a privately held not-for-profit national member association and service organization with over 60 m ...

("Triple-A") **

anti-aircraft artillery Anti-aircraft warfare, counter-air or air defence forces is the battlespace response to aerial warfare, defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action".AAP-6 It includes surface based, ...

Amateur Athletic Association The Amateur Athletic Association of England or AAA (pronounced 'three As') is the oldest national governing body for athletics in the world, having been established on 24 April 1880. Historically it effectively oversaw athletics throughout Brita ...

(of England) ** ''Asistencia Asesoría y Administración'' (Spanish, "Assistance, Consulting, and Administration" — original name of Mexican professional wrestling promotion

Lucha Libre AAA Worldwide Antonio Peña Promotions, S.A. de C.V. doing business as, d/b/a Lucha Libre AAA Worldwide is a Mexican Lucha Libre (professional wrestling) professional wrestling promotion, promotion based in Mexico City, Mexico. Commonly referred to as simply ...

) *

AAAI The Association for the Advancement of Artificial Intelligence (AAAI) is an international scientific society devoted to promote research in, and responsible use of, artificial intelligence. AAAI also aims to increase public understanding of artif ...

– (i)

Association for the Advancement of Artificial Intelligence The Association for the Advancement of Artificial Intelligence (AAAI) is an international scientific society devoted to promote research in, and responsible use of, artificial intelligence. AAAI also aims to increase public understanding of artif ...

, formerly American Association for Artificial Intelligence * AAAS – (i)

American Association for the Advancement of Science The American Association for the Advancement of Science (AAAS) is an American international non-profit organization with the stated goals of promoting cooperation among scientists, defending scientific freedom, encouraging scientific responsi ...

AAAV The Expeditionary Fighting Vehicle (EFV) (formerly known as the Advanced Amphibious Assault Vehicle (AAAV)) was an amphibious assault vehicle developed by General Dynamics during the 1990s and 2000s for use by the U.S. Marine Corps. It would ...

– (i)

Advanced Amphibious Assault Vehicle The Expeditionary Fighting Vehicle (EFV) (formerly known as the Advanced Amphibious Assault Vehicle (AAAV)) was an amphibious assault vehicle developed by General Dynamics during the 1990s and 2000s for use by the U.S. Marine Corps. It would ...

* AABN – (i)

African Aurora Business Network African Aurora Business Network, abbreviated as AABN, is an enterprise development Non-governmental Organization headquartered in Accra, Ghana. The organization assists micro and small scale enterprises (MSEs) and its environment through partners ...

* AABP – (i) American Association of Bovine Practitioners * AAC ** (i)

American Athletic Conference The American Athletic Conference (The American or AAC) is an American collegiate athletic conference, featuring 11 member universities and five affiliate member universities that compete in the National Collegiate Athletic Association's (NCAA ...

** Army Air Corps (

British Army The British Army is the principal land warfare force of the United Kingdom, a part of the British Armed Forces along with the Royal Navy and the Royal Air Force. , the British Army comprises 79,380 regular full-time personnel, 4,090 Gur ...

) * AACL – (i) Albanian American Civic League * AACCS – (i) American Association of Christian Colleges and Seminaries * AAD ** (i) analogue-analogue-digital (CD quality) **

Australian Antarctic Division The Australian Antarctic Division (AAD) is a division of the Department of Climate Change, Energy, the Environment and Water. The Division undertakes science programs and research projects to contribute to an understanding of Antarctica and th ...

AADD Adult attention deficit hyperactivity disorder is the neurological condition of attention deficit hyperactivity disorder (ADHD) in adults. About one-third to two-thirds of children with symptoms from early childhood continue to demonstrate ADHD s ...

– Adult attention deficit disorder *

AADT Annual average daily traffic, abbreviated AADT, is a measure used primarily in transportation planning, transportation engineering and retail location selection. Traditionally, it is the total volume of vehicle traffic of a highway or road for a ...

– (i) annual average daily traffic *

AADAC Arylacetamide deacetylase is an enzyme that in humans is encoded by the ''AADAC'' gene. Microsomal arylacetamide deacetylase competes against the activity of cytosolic arylamine N-acetyltransferase, which catalyzes one of the initial biotransf ...

– (a) Alberta Alcohol and Drug Abuse Commission * AADC ** (i) area air defense commander ** (i) amino acid decarboxylase ** (i) aromatic L-amino acid decarboxylase ** (i) Australian Antarctic Data Centre * AAFC ** (i) U.S.

Army Air Corps Ferrying Command Air Transport Command (ATC) was a United States Air Force unit that was created during World War II as the strategic airlift component of the United States Army Air Forces. It had two main missions, the first being the delivery of supplies ...

(1941–1942) **

All-America Football Conference The All-America Football Conference (AAFC) was a professional American football league that challenged the established National Football League (NFL) from 1946 to 1949. One of the NFL's most formidable challengers, the AAFC attracted many of the ...

(1946–1949) *

AAFES The Army & Air Force Exchange Service (AAFES, also referred to as The Exchange and The PX or The BX) is the retailer in U.S. Army and Air Force installations worldwide. The Exchange is headquartered in Dallas, Texas, and its director/chief exe ...

– (i)

Army and Air Force Exchange Service The Army & Air Force Exchange Service (AAFES, also referred to as The Exchange and The PX or The BX) is the retailer in U.S. Army and Air Force installations worldwide. The Exchange is headquartered in Dallas, Texas, and its director/chief exe ...

* AAI – (i) applied artificial intelligence * AAIS – (i) advanced airborne interceptor simulator *

AAM Aam is a Hamlet (place), hamlet in the Netherlands, Dutch province of Gelderland. It is located in the municipality of Overbetuwe, about 1 km east of the town of Elst (Overbetuwe), Elst.''ANWB Topografische Atlas Nederland'', Topografische ...

– (i)

air-to-air missile The newest and the oldest member of Rafael's Python family of AAM for comparisons, Python-5 (displayed lower-front) and Shafrir-1 (upper-back) An air-to-air missile (AAM) is a missile fired from an aircraft for the purpose of destroying ...

* AAMOF – (i)

as a matter of fact As, AS, A. S., A/S or similar may refer to: Art, entertainment, and media * A. S. Byatt (born 1936), English critic, novelist, poet and short story writer * "As" (song), by Stevie Wonder * , a Spanish sports newspaper * , an academic male voice ...

* AAN – (i)

American Academy of Nursing The American Academy of Nursing (AAN) is a professional organization that generates, synthesizes, and disseminates nursing knowledge to contribute to health policy and practice for the benefit of the public and the nursing profession. Founded in 1 ...

AANEAS The Anglo-Australian Near-Earth Asteroid Survey (AANEAS) operated from 1990 to 1996, becoming one of the most prolific programs of its type in the world. Apart from leading to the discovery of 38 near-Earth asteroids, 9 comets, 63 supernovae, severa ...

– (a) Anglo-Australian Near-Earth Asteroid Survey * AAODL – (i) Atmospheric Aerosols and Optics Data Library * a.a.p. – (i)

Associated Artists Productions Associated Artists Productions, Inc. (a.a.p.) later known as United Artists Associated was an American distributor of theatrical feature films and subjects for television. Associated Artists Productions was the copyright owner of the ''Popeye ...

(former film distributor) * AAP ** (i) advanced acquisition plan ** Allied administrative publication **

American Academy of Pediatrics The American Academy of Pediatrics (AAP) is an American professional association of pediatricians, headquartered in Itasca, Illinois. It maintains its Department of Federal Affairs office in Washington, D.C. Background The Academy was found ...

* AAPC – (i) Accounting and Auditing Policy Committee * aar – (s)

(ISO 639-2 code) * AAR ** (i) after-action review **

Association of American Railroads The Association of American Railroads (AAR) is an industry trade group representing primarily the major freight Rail transport, railroads of North America (Canada, Mexico and the United States). Amtrak and some regional Commuter rail in North Am ...

AARP AARP (formerly called the American Association of Retired Persons) is an interest group in the United States focusing on issues affecting those over the age of fifty. The organization said it had more than 38 million members in 2018. The magazi ...

– (i/s)

American Association of Retired Persons AARP (formerly called the American Association of Retired Persons) is an interest group in the United States focusing on issues affecting those over the age of fifty. The organization said it had more than 38 million members in 2018. The magazi ...

(now officially known only by the initials) * AAS ** (i) Advanced Automation System ** American Astronomical Society ("double-A-S") * AASPEM – (i) advanced air-to-air system performance evaluation model *

AAT AAT or Aat may refer to: Aviation * Asia Airfreight Terminal, Hong Kong International Airport * Altay Airport, Xinjiang, China * Location identifier for Alturas Municipal Airport, California, United States Biochemistry * Alpha 1-antitrypsin, ...

– (i)

Australian Antarctic Territory The Australian Antarctic Territory (AAT) is a part of East Antarctica claimed by Australia as an external territory. It is administered by the Australian Antarctic Division, an agency of the federal Department of Climate Change, Energy, the ...

* AAV – (i)

Amphibious Assault Vehicle The Assault Amphibious Vehicle (AAV)—official designation AAVP-7A1 (formerly known as Landing Vehicle, Tracked, Personnel-7 abbr. LVTP-7)—is a fully tracked amphibious landing vehicle manufactured by U.S. Combat Systems (previously by Uni ...

* AAWC – (i) anti-air warfare commander

AB

* ab – (s)

Abkhaz language Abkhaz ( ; ), sometimes spelled Abxaz and also known as Abkhazian, is a Northwest Caucasian languages, Northwest Caucasian language most closely related to Abaza language, Abaza. It is spoken mostly by the Abkhazians, Abkhaz people. It is one o ...

(ISO 639-1 code) * AB ** (i) Able Seaman (both the rank and

the occupation ''The Occupation'' is a single-player adventure video game developed by White Paper Games and released on PlayStation 4, Xbox One, and Microsoft Windows on 5 March 2019. The game takes place in a single government building, in real-time over fou ...

) ** (s)

Alberta Alberta ( ) is one of the thirteen provinces and territories of Canada. It is part of Western Canada and is one of the three prairie provinces. Alberta is bordered by British Columbia to the west, Saskatchewan to the east, the Northwest Ter ...

(postal symbol) *

ABA ABA may refer to: Businesses and organizations Broadcasting * Alabama Broadcasters Association, United States * Asahi Broadcasting Aomori, Japanese television station * Australian Broadcasting Authority Education * Académie des Beaux- ...

** (i)

Adriatic Basketball Association Adriatic Basketball Association – ABA League, G.P., commonly referred to as the ABA League JTD, is a Croatian company based in Zagreb. It is the general partnership for organizing sports competitions. The company has been running the Adriatic L ...

American Bar Association The American Bar Association (ABA) is a voluntary bar association of lawyers and law students, which is not specific to any jurisdiction in the United States. Founded in 1878, the ABA's most important stated activities are the setting of acad ...

American Basketball Association The American Basketball Association (ABA) was a major men's professional basketball league from 1967 to 1976. The ABA ceased to exist with the American Basketball Association–National Basketball Association merger in 1976, leading to four A ...

American Beverage Association The American Beverage Association (ABA) is a government lobbying group that represents the beverage industry in the United States. Its members include producers and bottlers of soft drinks, such as Coca-Cola and PepsiCo, bottled water, and othe ...

American Bicycle Association The American Bicycle Association (ABA) was a US-based BMX sports governing body in Gilbert, Arizona. In 2011, the ABA merged with the former National Bicycle League and became the current USA BMX. The organization was founded by Merl Mennenga an ...

American Birding Association The American Birding Association (ABA) is a nonprofit organization, founded in 1969, dedicated to recreational birding in Canada and the United States. It has been called "the standard-bearer for serious birding in North America." Originally co ...

Australian Broadcasting Authority The Australian Broadcasting Authority (ABA) was an Australian government agency whose main roles were to regulate broadcasting, radiocommunications and telecommunications. The Authority took over the functions of the Australian Broadcasting Trib ...

* ABB – (i)

ASEA Brown Boveri ABB Ltd. is a Swedish-Swiss multinational corporation headquartered in Zürich, Switzerland. The company was formed in 1988 when Sweden's Allmänna Svenska Elektriska Aktiebolaget (ASEA) and Switzerland's Brown, Boveri & Cie merged to create ...

(Swiss-Swedish multinational company) *

ABBA ABBA ( , , formerly named Björn & Benny, Agnetha & Anni-Frid or Björn & Benny, Agnetha & Frida) are a Swedish supergroup formed in Stockholm in 1972 by Agnetha Fältskog, Björn Ulvaeus, Benny Andersson, and Anni-Frid Lyngstad. The grou ...

– (a) Agnetha, Benny,

Björn Bjorn (English, Dutch), Björn (Swedish, Icelandic, Dutch, and German), Bjørn (Danish, Faroese and Norwegian), Beorn (Old English) or, rarely, Bjôrn, Biorn, or Latinized Biornus, Brum (Portuguese), is a Scandinavian male given name, or less oft ...

, Anni-Frid (Swedish pop group) * ABC ** (i) abstinence, be faithful, condoms **

Active Body Control Active Body Control, or ABC, is the Mercedes-Benz brand name used to describe electronically controlled hydropneumatic suspension. This suspension combines a high level of ride quality with control of the vehicle body motions, and therefore vi ...

** airway, breathing, circulation (see CPR) ** Alcoholic Beverage Commission ** alien big cat ** always be careful **

American Bird Conservancy American Bird Conservancy (ABC) is a non-profit membership organization with the mission of conserving wild birds and their habitats throughout the Americas. Its focus is on threats to birds in the Western Hemisphere – threats which include o ...

American-born Chinese American-born Chinese () (sometimes abbreviated as ABC) is a term widely used to refer to Chinese people that were born in the United States and received U.S. citizenship due to birthright citizenship in the United States. Contested usage ...

American Broadcasting Company The American Broadcasting Company (ABC) is an Television in the United States, American Commercial broadcasting, commercial broadcast television network. It is the flagship property of the Disney General Entertainment Content#Current assets, ...

anti-lock brake controller An anti-lock braking system (ABS) is a automobile safety, safety anti-Skid (automobile), skid Brake, braking system used on aircraft and on land motor vehicle, vehicles, such as cars, motorcycles, trucks, and buses. ABS operates by preventing t ...

** Associated British Cinemas ***

ABC Cinemas ABC Cinemas (Associated British Cinemas) was a cinema chain in the United Kingdom. Originally a wholly owned subsidiary of Associated British Picture Corporation (ABPC), it operated between the 1930s and the 1980s. The brand name was reused in ...

***

ABC Weekend TV ABC Weekend TV was the popular name of the British broadcaster ABC Television Limited, which provided the weekend service in the Midlands and Northern England regions of the Independent Television (ITV) network from 1956 to 1968. It was one ...

(Associated British Cinemas (Television) Ltd / ABC Television Ltd) ** Associated British Corporation (

ABC Television ABC Television most commonly refers to: *ABC Television Network of the American Broadcasting Company, United States, or *ABC Television (Australian TV network), a division of the Australian Broadcasting Corporation, Australia ABC Television or ABC ...

Films Ltd) ** Atanasoff–Berry Computer ** Atlantic Baptist College ** atomic, biological, chemical (see NBC) **

Australian Broadcasting Corporation The Australian Broadcasting Corporation (ABC) is the national broadcaster of Australia. It is principally funded by direct grants from the Australian Government and is administered by a government-appointed board. The ABC is a publicly-own ...

** already been chewed gum * ABCA ** (i) American, British and Canadian Armies (originally) ** Army Bureau of Current Affairs * ABCS – (i) (U.S.) Army Battle Command System *

ABET The ABET (incorporated as the Accreditation Board for Engineering and Technology, Inc.) is a non-governmental organization that accredits post-secondary education programs in applied and natural sciences, computing, engineering and engineerin ...

– (a)

Accreditation Board for Engineering and Technology The ABET (incorporated as the Accreditation Board for Engineering and Technology, Inc.) is a non-governmental organization that accredits post-secondary education programs in applied and natural sciences, computing, engineering and enginee ...

* ABFIST – (i) Advanced Bradley Full Crew Interactive Skills Trainer * ABGI – (i) Addington-Barker Group International *

ABIN The Brazilian Intelligence Agency ( pt, Agência Brasileira de Inteligência, ABIN) is the main intelligence agency in Brazil. ABIN's mission is to ensure that the Federal Executive has access to knowledge related to the security of the State a ...

– (a) Agência Brasileira de Inteligência (Brazilian Intelligence Agency) * abk – (s)

(ISO 639-2 code) * ABL – (i) American Basketball League * ABLE – (a) AirBorne Law Enforcement (police air support unit) * ABM – (i) anti-ballistic missile –

Asynchronous Balanced Mode High-Level Data Link Control (HDLC) is a bit-oriented code-transparent synchronous data link layer protocol developed by the International Organization for Standardization (ISO). The standard for HDLC is ISO/IEC 13239:2002. HDLC provides both ...

–

automated banking machine An automated teller machine (ATM) or cash machine (in British English) is an electronic telecommunications device that enables customers of financial institutions to perform financial transactions, such as cash withdrawals, deposits, f ...

ABMC The American Battle Monuments Commission (ABMC) is an independent agency of the United States government that administers, operates, and maintains permanent U.S. military cemeteries, memorials and monuments primarily outside the United States. ...

– (i)

American Battle Monuments Commission The American Battle Monuments Commission (ABMC) is an Independent agencies of the United States government, independent agency of the United States government that administers, operates, and maintains permanent U.S. military cemeteries, memorial ...

* ABN ** (i)

Australian Business Number The Australian Business Number (ABN) is a unique 11-digit identifier issued by the Australian Business Register (ABR) which is operated by the Australian Taxation Office (ATO). The ABN was introduced on 1 July 2000 by John Howard's Liberal gove ...

(a number issued by the Australian government as registration of a business and used for taxation purposes) ** Advance Beneficiary Notice of Non-coverage (a form used in health insurance) * ABPI – (i)

Association of the British Pharmaceutical Industry The Association of the British Pharmaceutical Industry (ABPI) is the trade association for over 120 companies in the UK producing prescription medicines for humans, founded in 1891.

ABRSM The ABRSM (Associated Board of the Royal Schools of Music) is an examination board and registered charity based in the United Kingdom. ABRSM is one of five examination boards accredited by Ofqual to award graded exams and diploma qualificatio ...

– (a)

Associated Board of the Royal Schools of Music The ABRSM (Associated Board of the Royal Schools of Music) is an examination board and registered charity based in the United Kingdom. ABRSM is one of five examination boards accredited by Ofqual to award graded exams and diploma qualificatio ...

* ABS ** (i)

acrylonitrile butadiene styrene Acrylonitrile butadiene styrene (ABS) (chemical formula (C8H8)''x''·(C4H6)''y''·(C3H3N)''z'' is a common thermoplastic polymer. Its glass transition temperature is approximately . ABS is amorphous and therefore has no true melting point. A ...

anti-lock braking system An anti-lock braking system (ABS) is a safety anti- skid braking system used on aircraft and on land vehicles, such as cars, motorcycles, trucks, and buses. ABS operates by preventing the wheels from locking up during braking, thereby maintai ...

* ABSA – (a)

Amalgamated Banks of South Africa Amalgamation is the process of combining or uniting multiple entities into one form. Amalgamation, amalgam, and other derivatives may refer to: Mathematics and science * Amalgam (chemistry), the combination of mercury with another metal ** Pan am ...

("ab-sa") * ABSTRIPS – (p) abstraction-based STRIPS * ABV – (i)

Alcohol by volume Alcohol by volume (abbreviated as ABV, abv, or alc/vol) is a standard measure of how much alcohol (ethanol) is contained in a given volume of an alcoholic beverage (expressed as a volume percent). It is defined as the number of millilitres (mL) o ...

* ABW – (s) Aruba (ISO 3166 trigram)

AC

* aC – (s)

Attocoulomb The coulomb (symbol: C) is the unit of electric charge in the International System of Units (SI). In 2019 redefinition of the SI base units, the present version of the SI it is equal to the electric charge delivered by a 1 ampere constant curre ...

* Ac – (s)

Actinium Actinium is a chemical element with the symbol Ac and atomic number 89. It was first isolated by Friedrich Oskar Giesel in 1902, who gave it the name ''emanium''; the element got its name by being wrongly identified with a substance A ...

* AC ** (i) Adriamycin-Cyclophosphamide (chemotherapy) **

Air Conditioning Air conditioning, often abbreviated as A/C or AC, is the process of removing heat from an enclosed space to achieve a more comfortable interior environment (sometimes referred to as 'comfort cooling') and in some cases also strictly controlling ...

Aircraftman Aircraftman (AC) or aircraftwoman (ACW) is the lowest rank in the British Royal Air Force (RAF) and the air forces of several other Commonwealth countries. In RAF slang, aircraftmen are sometimes called "erks". Aircraftman ranks below leading a ...

Alternating Current Alternating current (AC) is an electric current which periodically reverses direction and changes its magnitude continuously with time in contrast to direct current (DC) which flows only in one direction. Alternating current is the form in which ...

Altocumulus Altocumulus (From Latin ''Altus'', "high", ''cumulus'', "heaped") is a middle-altitude cloud genus that belongs mainly to the ''stratocumuliform'' physical category characterized by globular masses or rolls in layers or patches, the individual ele ...

** ''ante Christum'' (Latin, "before Christ"; see BC) ** ''ante cibum'' (Latin, "before meals") ** (s)

Antigua and Barbuda Antigua and Barbuda (, ) is a sovereign country in the West Indies. It lies at the juncture of the Caribbean Sea and the Atlantic Ocean in the Leeward Islands part of the Lesser Antilles, at 17°N latitude. The country consists of two ...

(FIPS 10-4 country code) ** (i) ''Associazione Calcio'' (Italian, "football (soccer) club") * A/C – (i) Air Conditioned/Conditioning – Aircraft * AC1 –

Aircraftman 1st Class Aircraftman (AC) or aircraftwoman (ACW) is the lowest rank in the British Royal Air Force (RAF) and the air forces of several other Commonwealth countries. In RAF slang, aircraftmen are sometimes called "erks". Aircraftman ranks below leading ai ...

* AC2 –

Aircraftman 2nd Class Aircraftman (AC) or aircraftwoman (ACW) is the lowest rank in the British Royal Air Force (RAF) and the air forces of several other Commonwealth countries. In RAF slang, aircraftmen are sometimes called "erks". Aircraftman ranks below leading a ...

* ACA **

Affordable Care Act The Affordable Care Act (ACA), formally known as the Patient Protection and Affordable Care Act and colloquially known as Obamacare, is a landmark U.S. federal statute enacted by the 111th United States Congress and signed into law by Pres ...

, shorthand for the Patient Protection and Affordable Care Act, commonly called "Obamacare" ** (i) Airspace Control Authority ** Airspace Co-ordination Area ** '' A Current Affair'' * ACAB, short for "All Cops Are Bastards"; used as a

political slogan The following is a list of notable political slogans. Political slogan (listed alphabetically) A * Abki baar Modi Sarkar – Bharatiya Janata Party's campaign slogan for 2014 Indian Parliamentary Elections * ACT UP, Fight Back, Fight AIDS – ...

associated with

dissident A dissident is a person who actively challenges an established political or religious system, doctrine, belief, policy, or institution. In a religious context, the word has been used since the 18th century, and in the political sense since the 20th ...

s who are opposed to the

police The police are a constituted body of persons empowered by a state, with the aim to enforce the law, to ensure the safety, health and possessions of citizens, and to prevent crime and civil disorder. Their lawful powers include arrest a ...

. *

ACARS In aviation, ACARS (; an acronym for Aircraft Communications Addressing and Reporting System) is a digital datalink system for transmission of short messages between aircraft and ground stations via airband radio or satellite. The protocol was d ...

– (a) Aircraft Communications Addressing and Reporting System *

ACAS The Advisory, Conciliation and Arbitration Service (Acas) is a Crown non-departmental public body of the Government of the United Kingdom. Its purpose is to improve organisations and working life through the promotion and facilitation of strong ...

** (a) Aboriginal Children's Advancement Society **

Advisory, Conciliation and Arbitration Service The Advisory, Conciliation and Arbitration Service (Acas) is a Crown non-departmental public body of the Government of the United Kingdom. Its purpose is to improve organisations and working life through the promotion and facilitation of strong ...

* ACB – (i) '' Asociación de Clubes de Baloncesto'' (Spanish for "Association of Basketball Clubs") * ACC ** (i) U.S.

Air Combat Command Air Combat Command (ACC) is one of nine Major Commands (MAJCOMs) in the United States Air Force, reporting to Headquarters, United States Air Force (HAF) at the Pentagon. It is the primary provider of air combat forces for the Air Force, and i ...

** Air Component Commander ** Alpine Club of Canada ** Altocumulus castellanus **

Area control center In air traffic control, an area control center (ACC), also known as a center or en-route center, is a facility responsible for controlling aircraft flying in the airspace of a given flight information region (FIR) at high altitudes between ai ...

** Atlantic Coast Conference ** Automatic climate control * ACCA ** (i) The

Association of Chartered Certified Accountants Founded in 1904, the Association of Chartered Certified Accountants (ACCA) is the global professional accounting body offering the Chartered Certified Accountant qualification (ACCA). It has 240,952 members and 541,930 future members worldwid ...

** Automatic Cloud Cover Assessment *

ACCAC ACCAC (the acronym of Awdurdod Cymwysterau, Cwricwlwm ac Asesu Cymru) was the Qualifications, Curriculum and Assessment Authority for Wales. On 1 April 2006, it merged with the Welsh Assembly Government's new Department for Children, Education, ...

– (a) ''Awdurdod Cymwysterau, Cwricwlwm ac Asesu Cymru'' (Qualifications, Curriculum and Assessment Authority for Wales) * ACCD –

American Coalition of Citizens with Disabilities The American Coalition of Citizens with Disabilities (ACCD) was, in the mid-1970s to early 1980s, a national consumer-led disability rights organization called, by nationally syndicated columnist Jack Anderson and others, "the handicapped lobby". ...

* ACCS – (i) Air Communications and Control Squadron * ACDA – (i) Arms Control & Disarmament Agency * ACDC ** (i) Alternating Current Direct Current ** the name of an Australian rock music band ** a term for a

bisexual Bisexuality is a romantic or sexual attraction or behavior toward both males and females, or to more than one gender. It may also be defined to include romantic or sexual attraction to people regardless of their sex or gender identity, wh ...

person * A/Cdre – Air Commodore * ACDT ** (a) Apple Certified Desktop Technician ** (a)

Australian Central Daylight Time Australia uses three main time zones: Australian Western Standard Time (AWST; UTC+08:00), Australian Central Standard Time (ACST; UTC+09:30), and Australian Eastern Standard Time (AEST; UTC+10:00). Time is regulated by the individual state ...

ACE An ace is a playing card, die or domino with a single pip. In the standard French deck, an ace has a single suit symbol (a heart, diamond, spade, or club) located in the middle of the card, sometimes large and decorated, especially in the ca ...

** (a) Air Combat Emulator (computer game) **

Allied Command Europe An alliance is a relationship among people, groups, or states that have joined together for mutual benefit or to achieve some common purpose, whether or not explicit agreement has been worked out among them. Members of an alliance are called ...

Angiotensin-converting enzyme Angiotensin-converting enzyme (), or ACE, is a central component of the renin–angiotensin system (RAS), which controls blood pressure by regulating the volume of fluids in the body. It converts the hormone angiotensin I to the active vasoconstr ...

Armored Combat Earthmover The M9 Armored Combat Earthmover (ACE) is a highly mobile armored tracked vehicle that provides combat engineer support to front-line forces. Fielded by the United States Army, its tasks include eliminating enemy obstacles, maintenance and repair ...

** Automatic Computing Engine * ACE2 – (i/p)

Angiotensin-converting enzyme 2 Angiotensin-converting enzyme 2 (ACE2) is an enzyme that can be found either attached to the membrane of cells (mACE2) in the intestines, kidney, testis, gallbladder, and heart or in a soluble form (sACE2). Both membrane bound and soluble ACE2 ...

(pronounced "ace-two") * ACES ** (a) '' Aerolíneas Centrales de Colombia'' (Spanish, "Central Colombian Airlines") ** Auxiliary Campus Enterprises and Services of

Alfred State College Alfred State College (ASC, SUNY Alfred, SUNY Alfred State) is a public college in Alfred, New York. It is part of the State University of New York (SUNY) system. The college, formerly the Technical College at Alfred, offers a wide variety o ...

* ACF ** (i)

Administration for Children and Families The Administration for Children and Families (ACF) is a division of the United States Department of Health and Human Services (HHS). It is headed by the Assistant Secretary of Health and Human Services for Children and Families. It has a $49 bill ...

American Car and Foundry ACF Industries, originally the American Car and Foundry Company (abbreviated as ACF), is an American manufacturer of railroad rolling stock. One of its subsidiaries was once (1925–54) a manufacturer of motor coaches and trolley coaches und ...

American Culinary Federation The American Culinary Federation (ACF) was established in 1929 in New York City and is the largest professional chefs' organization in North America. It was the progeny of the combined visions of three chefs' associations in New York City, the Soci ...

* ACH – (i)

Automated clearing house An automated clearing house (ACH) is a computer-based electronic network for processing transactions, usually domestic low value payments, between participating financial institutions. It may support both credit transfers and direct debits. Th ...

ACHT Acht may refer to: Legal history *German-language term for outlawry ** Imperial ban in the Holy Roman Empire People *René Acht (1920 – 1998), Swiss painter and graphic artist Places * Acht, Rhineland-Palatinate, Germany *Acht, village within ...

– (i) Average Call Hold Time * ACID – (a) Atomicity, Consistency, Isolation, and Durability (in

database In computing, a database is an organized collection of data stored and accessed electronically. Small databases can be stored on a file system, while large databases are hosted on computer clusters or cloud storage. The design of databases spa ...

s) *

ACINT Acoustical intelligence (ACOUSTINT, sometimes ACINT) is an intelligence gathering discipline that collects and processes acoustic phenomena. It is a subdiscipline of MASINT ( Measurement and Signature Intelligence). This uses broadband and narro ...

– (p) Acoustic Intelligence * ACK – (p) Acknowledge (telecommunications; cf. NAK) * ACL ** (i)

Access Control List In computer security, an access-control list (ACL) is a list of permissions associated with a system resource (object). An ACL specifies which users or system processes are granted access to objects, as well as what operations are allowed on giv ...

Anterior cruciate ligament The anterior cruciate ligament (ACL) is one of a pair of cruciate ligaments (the other being the posterior cruciate ligament) in the human knee. The two ligaments are also called "cruciform" ligaments, as they are arranged in a crossed formation ...

; the initialism can also refer to an injury to this ligament **

Atlantic Coast Line Railroad The Atlantic Coast Line Railroad was a United States Class I railroad formed in 1900, though predecessor railroads had used the ACL brand since 1871. In 1967 it merged with long-time rival Seaboard Air Line Railroad to form the Seaboard Coas ...

ACLJ The American Center for Law & Justice (ACLJ) is a politically conservative, Christian-based legal organization in the United States. It is headquartered in Washington, D.C., and associated with Regent University School of Law in Virginia Beach, Vi ...

– (i)

American Center for Law and Justice The American Center for Law & Justice (ACLJ) is a politically conservative, Christian-based legal organization in the United States. It is headquartered in Washington, D.C., and associated with Regent University School of Law in Virginia Beach, ...

* ACLOS – (i) Automatic CLOS (missile control system) * ACLS – (i) American Council of Learned Societies *

ACLU The American Civil Liberties Union (ACLU) is a nonprofit organization founded in 1920 "to defend and preserve the individual rights and liberties guaranteed to every person in this country by the Constitution and laws of the United States". ...

** (i)

American Civil Liberties Union The American Civil Liberties Union (ACLU) is a nonprofit organization founded in 1920 "to defend and preserve the individual rights and liberties guaranteed to every person in this country by the Constitution and laws of the United States". ...

** American Communist Lawyers Union (pejorative slang for the above) * ACM – many, including

Association for Computing Machinery The Association for Computing Machinery (ACM) is a US-based international learned society for computing. It was founded in 1947 and is the world's largest scientific and educational computing society. The ACM is a non-profit professional member ...

; ''see entry'' * ACMC – (i) (U.S.) Assistant Commandant of the Marine Corps * ACN ** (i) Airborne Communications Node ** Australian Company Number (number issued by the Australian government as registration of a limited liability company) * ACNA – (i)

Anglican Church in North America The Anglican Church in North America (ACNA) is a Christian denomination in the Anglican tradition in the United States and Canada. It also includes ten congregations in Mexico, two mission churches in Guatemala, and a missionary diocese in Cu ...

ACO ACO, AcO, or Aco may refer to: Organizations * Accountable care organization, healthcare organization characterized by a specific payment and care delivery model * Aco Records, a British 1920s record label * ACO, C.A., a Venezuelan holding compan ...

– (i) Airspace Control Order * ACOBA – (a)

Advisory Committee on Business Appointments The Advisory Committee on Business Appointments (ACOBA) is a non-departmental public body in the United Kingdom, which was set up in 1975 to provide advice on applications from the most senior Crown servants who wish to take up outside appointment ...

* ACOG – (a)

American College of Obstetricians and Gynecologists The American College of Obstetricians and Gynecologists (ACOG) is a professional association of physicians specializing in obstetrics and gynecology in the United States. Several Latin American countries are also represented within Districts of ...

ACOM is one of Japan's largest consumer loan companies, (or '' sarakin''). The name "Acom" stands for Affection, Confidence and Moderation. The company was founded by Masao Kinoshita, who was later replaced by his eldest son Kyosuke Kinoshita is the ...

– (p) (U.S.) Atlantic Command *

ACORN The acorn, or oaknut, is the nut of the oaks and their close relatives (genera '' Quercus'' and ''Lithocarpus'', in the family Fagaceae). It usually contains one seed (occasionally two seeds), enclosed in a tough, leathery shell, and bo ...

– (a) Association of Community Organizations for Reform Now * ACP ** (i)

African, Caribbean and Pacific Group of States The Organisation of African, Caribbean and Pacific States (OACPS) is a group of countries in Africa, the Caribbean, and the Pacific that was created by the Georgetown Agreement in 1975. Formerly known as African, Caribbean and Pacific Group ...

** Air Control Point * ACR – (i) Advanced Concepts and Requirements * ACRI – (p) African Crisis Initiative * ACRT – (i) Advanced Concepts Research Tool simulator * ACS ** (i) Affiliated Computer Services (NYSE ACS) ** Alaska Communications Service **

American Cancer Society The American Cancer Society (ACS) is a nationwide voluntary health organization dedicated to eliminating cancer. Established in 1913, the society is organized into six geographical regions of both medical and lay volunteers operating in more tha ...

American Chemical Society The American Chemical Society (ACS) is a scientific society based in the United States that supports scientific inquiry in the field of chemistry. Founded in 1876 at New York University, the ACS currently has more than 155,000 members at all ...

Association of Caribbean States The Association of Caribbean States (ACS; es, Asociación de Estados del Caribe; french: Association des États de la Caraïbe) is an advisory association of nations centered on the Caribbean Basin. It was formed with the aim of promoting con ...

** Australian Computer Society * ACSC – (i) Army Command and Staff College (various nations) * ACST – (i)

Australian Central Standard Time Australia uses three main time zones: Australian Western Standard Time (AWST; UTC+08:00), Australian Central Standard Time (ACST; UTC+09:30), and Australian Eastern Standard Time (AEST; UTC+10:00). Time is regulated by the individual state ...

* ACST – (i) American Cooperative School of Tunis * ACT ** (i) Adaptive Control of Thought (cognitive model) ** American College Test (ing Program) **

Australian Capital Territory The Australian Capital Territory (commonly abbreviated as ACT), known as the Federal Capital Territory (FCT) until 1938, is a landlocked federal territory of Australia containing the national capital Canberra and some surrounding townships. ...

(also postal symbol) *

ACT UP AIDS Coalition to Unleash Power (ACT UP) is an international, grassroots political group working to end the AIDS pandemic. The group works to improve the lives of people with AIDS through direct action, medical research, treatment and advocacy ...

– (a)

AIDS Coalition to Unleash Power AIDS Coalition to Unleash Power (ACT UP) is an international, grassroots political group working to end the AIDS pandemic. The group works to improve the lives of people with AIDS through direct action, medical research, treatment and advocacy, ...

* ACTD – (i) Advanced Concept Technology Demonstration * ACTF ** (i) (U.S.) Army Constructive Training Federation **

Australian Children's Television Foundation The Australian Children's Television Foundation (ACTF) is a national non-profit children's media production and policy hub. The ACTF helps develop children's television policy; distributes and pays for Australian children's television series; ...

ACT-R ACT-R (pronounced /ˌækt ˈɑr/; short for "Adaptive Control of Thought—Rational") is a cognitive architecture mainly developed by John Robert Anderson (psychologist), John Robert Anderson and Christian Lebiere at Carnegie Mellon University. Li ...

– (i) ACT-Rational (cognitive model) * ACT-R/PM – (i) ACT-R/Perceptual-Motor (cognitive model) *

ACTU The Australian Council of Trade Unions (ACTU), originally the Australasian Council of Trade Unions, is the largest peak body representing workers in Australia. It is a national trade union centre of 46 affiliated unions and eight trades and la ...

– (i)

Australian Council of Trade Unions The Australian Council of Trade Unions (ACTU), originally the Australasian Council of Trade Unions, is the largest peak body representing workers in Australia. It is a national trade union centre of 46 affiliated unions and eight trades and ...

* ACU ** (i)

Abilene Christian University Abilene Christian University (ACU) is a private Christian university in Abilene, Texas. It was founded in 1906 as ''Childers Classical Institute''. ACU is one of the largest private universities in the Southwestern United States and has one of t ...

American Conservative Union The American Conservative Union (ACU) is an American political organization that advocates for conservative policies, ranks politicians based on their level of conservatism, and organizes the Conservative Political Action Conference. Founded o ...

* ACUF ** (i) BGN

Advisory Committee on Undersea Features The United States Board on Geographic Names (BGN) is a federal body operating under the United States Secretary of the Interior. The purpose of the board is to establish and maintain uniform usage of geographic names throughout the federal gov ...

** (a) American Conservative Union Foundation * ACV – (i) Armoured Combat Vehicle

* AD – (i) Air Defence – (s)

Andorra , image_flag = Flag of Andorra.svg , image_coat = Coat of arms of Andorra.svg , symbol_type = Coat of arms , national_motto = la, Virtus Unita Fortior, label=none ( Latin)"United virtue is str ...

(ISO 3166 digram) – (i) ''

Anno Domini The terms (AD) and before Christ (BC) are used to label or number years in the Julian and Gregorian calendars. The term is Medieval Latin and means 'in the year of the Lord', but is often presented using "our Lord" instead of "the Lord", ...

'' (Latin, "In the year of our

Lord Lord is an appellation for a person or deity who has authority, control, or power over others, acting as a master, chief, or ruler. The appellation can also denote certain persons who hold a title of the peerage in the United Kingdom, or ...

") * A/D – (i) Analog/Digital * ADA ** (i) Air Defence Artillery **

American Dental Association The American Dental Association (ADA) is an American professional association established in 1859 which has more than 161,000 members. Based in the American Dental Association Building in the Near North Side of Chicago, the ADA is the world's ...

Assistant District Attorney In the United States, a district attorney (DA), county attorney, state's attorney, prosecuting attorney, commonwealth's attorney, or state attorney is the chief prosecutor and/or chief law enforcement officer representing a U.S. state in a l ...

Americans with Disabilities Act The Americans with Disabilities Act of 1990 or ADA () is a civil rights law that prohibits discrimination based on disability. It affords similar protections against discrimination to Americans with disabilities as the Civil Rights Act of 19 ...

(see also the similar but non-acronymic Ada programming language) ** ADA Cryptocurrency token for Cardano blockchain *

ADAC ADAC, officially the Allgemeiner Deutscher Automobil-Club (), is Europe's largest motoring association. ADAC is the largest club (Verein) in Germany with around 21 million members. It would be more aptly described today as an individual m ...

– (a/i) ''Allgemeiner Deutscher Automobil-Club'' (German, "General German Automobile Club") * ADAGE – (a)

Air Defense Air to Ground Engagement The atmosphere of Earth is the layer of gases, known collectively as air, retained by Earth's gravity that surrounds the planet and forms its planetary atmosphere. The atmosphere of Earth protects life on Earth by creating pressure allowing ...

(simulation) * ADAP – (i)

AIDS Drug Assistance Program AIDS Drug Assistance Programs are a set of programs in all 50-states in the United States that provide Food and Drug Administration-approved HIV treatment drugs to low income patients in the U.S. The programs are administered by each state with ...

* ADAS – (a/i)

Asiago-DLR Asteroid Survey The Asiago-DLR Asteroid Survey (ADAS; obs. code: 209) was an astronomical survey conducted in the early 2000s to search for comets and asteroids, with special emphasis on near-Earth objects. The Minor Planet Center directly credits ADAS w ...

ADAT Alesis Digital Audio Tape (ADAT) is a magnetic tape format used for the recording of eight digital audio tracks onto the same S-VHS tape used by consumer VCRs. Although it is a tape-based format, the term ''ADAT'' now refers to its succe ...

– (i) Alesis Digital Audio Tape (recording format) * ADatP – (p) Automated Data Processing * ADATS – ** (i) Agricultural Development and Training Society ** Air Defence Anti-Tank System ** Australian Defence Air Traffic System * ADB – (i)

Asian Development Bank The Asian Development Bank (ADB) is a regional development bank established on 19 December 1966, which is headquartered in the Ortigas Center located in the city of Mandaluyong, Metro Manila, Philippines. The bank also maintains 31 field offi ...

* ADB- All da best/All the best - texting slang * ADC – ** (i) Aide De Camp ** U.S.

Air Defense Command Aerospace Defense Command was a major command of the United States Air Force, responsible for continental air defense. It was activated in 1968 and disbanded in 1980. Its predecessor, Air Defense Command, was established in 1946, briefly ina ...

(1946–1992) ** Apple Display Connector ** Program Against Digital Counterfeiting of Currency * ADCTS – (i) Advanced Distributed Combat Training System *

ADD Addition (usually signified by the plus symbol ) is one of the four basic operations of arithmetic, the other three being subtraction, multiplication and division. The addition of two whole numbers results in the total amount or '' sum'' of t ...

– ** (i) Analog Digital Digital ( CD quality) **

Attention-Deficit Disorder Attention deficit hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterised by excessive amounts of inattention, hyperactivity, and impulsivity that are pervasive, impairing in multiple contexts, and otherwise age-inappr ...

** Administration on Developmental Disabilities * ADDIE – (i) Analyze Design Develop Implement and Evaluate * ADDNS – (i) Advanced Deployable Day/Night Simulation * ADE ** (i)

Algebraic differential equation In mathematics, an algebraic differential equation is a differential equation that can be expressed by means of differential algebra. There are several such notions, according to the concept of differential algebra used. The intention is to i ...

Antibody-dependent enhancement Antibody-dependent enhancement (ADE), sometimes less precisely called immune enhancement or disease enhancement, is a phenomenon in which binding of a virus to suboptimal antibodies enhances its entry into host cells, followed by its rep ...

* ADF ** (i)

Australian Defence Force The Australian Defence Force (ADF) is the military organisation responsible for the defence of the Commonwealth of Australia and its national interests. It consists of the Royal Australian Navy (RAN), Australian Army, Royal Australian Air Fo ...

African Development Foundation The United States African Development Foundation (USADF) is an independent United States government agency that provides grants of up to $250,000 for operational assistance, enterprise expansion and market linkage to early stage agriculture, e ...

* ADGB – Air Defence of Great Britain * ADHD – (i) Attention-Deficit Hyperactivity Disorder * ADHS (disambiguation), ADHS – (i) Attention-Deficit Hyperactivity Syndrome * ADI (disambiguation), ADI – (i) Acceptable/Allowable Daily Intake * ADIZ – (a/i) Air Defence Identification Zone * ADL (disambiguation), ADL – (i) Anti-Defamation League * ad loc. – (p) ''ad locum'' (Latin, "to/at the place") * ADM (disambiguation), ADM – ** (i) Administrative ** (s) Admiral, and the U.S. Public Health Service Commissioned Corps ** Archer Daniels Midland ** Assistant Deputy Minister * ADOA – (a/i) Air Defence Operations Area * ADP (disambiguation), ADP – ** (i) Adenosine DiPhosphate ** Army Doctrine Publication (UK, Canada, Australia) ** Automatic/Automated Data Processing * ADRG – (p) Arc-second Raster Chart (ARC) Digitized Raster Graphics * ADS (disambiguation), ADS – ** (a/i) Active Denial System ** Astrophysics Data System ** Attention Deficit Syndrome * ADSR (disambiguation), ADSR – (i) Attack, Decay, Sustain, Release (sound envelope specification) * ADT (disambiguation), ADT ** (i) Abu Dhabi Terminals, operator of commercial ports in Abu Dhabi ** American District Telegraph, a former name of ADT Inc. ** Atlantic Daylight Time (UTC−3 hours) * ADTB – (i) Army Doctrine and Training Bulletin * adv. – (p) ''adversus'' (Latin, "against") * ADW (disambiguation), ADW – (i) Air Defence Warning

AE

* AE (disambiguation), ae – (s) Avestan language (ISO 639-1 code) * AE (disambiguation), AE ** (s) Armed Forces Africa/Canada/Europe/Middle East (postal symbol) ** United Arab Emirates (ISO 3166 digram; FIPS 10-4 country code) ** (i) Artix Entertainment ** American Eagle * A&E (disambiguation), A&E ** (a/i) Arts & Entertainment Network, the original name for the U.S. TV channel now known as A&E Network ** Accident and Emergency * AEB – Autonomous Emergency Braking, see Collision avoidance system * AED (disambiguation), AED – (s) United Arab Emirates dirham (ISO 4217 currency code) * AEDT – (a) Australian Eastern Daylight Time * AEF (disambiguation), AEF – (i) American Expeditionary Force * Aegis (disambiguation), AEGIS – (p) Airborne Early warning Ground environment Interface Segment (fake etymology) * AEI-T – (i) Army Enterprise Infostructure-Transport * wikt:aeq., aeq. – (p) ''aequalis'' (Latin, "equal") * AESR – (i) Aeronautical Equipment Service Record * AEST – (a) Australian Eastern Standard Time * aet. – (p) ''aetatis'' (Latin, "of age", "aged") * AET (disambiguation), aet – (i) After extra time (Football) * AEW (disambiguation), AEW ** (i) Air Expeditionary Wing ** (i) Airborne early warning and control, Airborne early warning ** (i) Airborne electronic warfare ** (i) All Elite Wrestling (US professional wrestling promotion)

AF

* AF (disambiguation), af – (s) Afrikaans language (ISO 639-1 code) * AF (disambiguation), aF – (s) Attofarad * AF (disambiguation), AF ** (s) Afghanistan (FIPS 10-4 country code; ISO 3166 digram) ** (i) Air Force ** As fuck * AFA (disambiguation), AFA ** (i) U.S. United States Air Force Academy, Air Force Academy ** ''Argentine Football Association, Asociación del Fútbol Argentino'' (Spanish, "Argentine Association football, Football Association") * AFAIC – (i) As Far As I'm Concerned * AFAICT – (i) As Far As I Can Tell * AFAIK – (i) As Far As I Know * AFAIR – (i) As Far As I Remember/Recall * AFAM ** (i/a) ''Associazione Friulana di Astronomia e Meteorologia'' (Italian, "Friuli Association of Astronomy and Meteorology") ** (p) Department of African and Afro-American Studies, University of North Carolina at Chapel Hill — notable for its links to University of North Carolina academic-athletic scandal, the school's academic-athletic scandal in the 2010s * Project Manager Battle Command#Advanced Field Artillery Tactical Data System (AFATDS), AFATDS – (i) Project Manager Battle Command#Advanced Field Artillery Tactical Data System (AFATDS), Advanced Field Artillery Tactical Data System * AFC (disambiguation), AFC ** (i) American Football Conference ** Approved for construction ** Asian Football Confederation * AFCEA – (i) Armed Forces Communications and Electronics Association * AfD ** (i) ''Alliance for Germany, Allianz für Deutschland'' ("Alliance for Germany"), former political alliance in East Germany ** ''Alternative for Germany, Alternative für Deutschland'' ("Alternative for Germany"), current German political party * AFD ** (i) Active Format Description, a technical standard for TV or set-top box decoders ** Advanced Format Drive, a type of computing storage device ** Adjustable-frequency drive ** Adult Film Database, web-based database of adult cinema ** ''French Development Agency, Agence française de développement'' ("French Development Agency"), a French international development agency ** ''Alliance of Democratic Forces, Alliance des forces démocratiques'' (French; "Alliance of Democratic Forces"), an Ivorian political alliance ** Alliance for Freedom and Democracy, an Eritrean political party * AFDB (disambiguation), AFDB – (i) African Development Bank * AFES (disambiguation), AFES – (i) Automatic Fire Extinguishing System * AFG (disambiguation), AFG – (s) Afghanistan (ISO 3166 trigram) * AFGAM – (i) Amazon Facebook Google Apple Microsoft * AFI (disambiguation), AFI ** (s) Djibouti, French Territory of the Afars and Issas (ISO 3166 trigram; obsolete since 1977) ** (i) "Agencia Federal de Investigaciónes" (México) * AFIS (disambiguation), AFIS ** (a) Automated fingerprint identification, Automated Fingerprint Identification System ** American Forces Information Service * AFIST – (i) Abrams Full Crew Interactive Skills Trainer * AFJ (disambiguation), AFJ – (i) April Fool's Day, April Fool's Joke * AFK (disambiguation), AFK – (i) Away From Keyboard (Internet chat abbreviation) * AFL (disambiguation), AFL ** (i) American Federation of Labor ** American Football League — either the American Football League, 1960s league that merged into the National Football League, or American Football League (disambiguation), one of several other leagues of American football ** Arena Football League ** Australian Football League * AFL–CIO – (i
American Federation of Labor – Congress of Industrial Organizations
* Aflac, AFLAC – (a) American Family Life Assurance Company of Columbus * AFM (disambiguation), AFM – (i) Army Field Manual (UK; the U.S. more frequently uses just FM) – Atomic Force Microscope – Aviation Fleet Maintenance * AFN (disambiguation), AFN – (s) Afghan afghani, Afghani (ISO 4217 currency code) * AFO (disambiguation), AFO – (i) Association of Field Ornithologists * AFOSR – (i) U.S. Air Force Office of Scientific Research * AFP (disambiguation), AFP ** (i) ''Agence France-Presse'' (French, "French Press Agency") ** Australian Federal Police * AFQT – (i) Armed Forces Qualification Test * AFR (disambiguation), afr – (s) Afrikaans language (ISO 639-2 code) * AFRC (disambiguation), AFRC – (i) Air Force Reserve Command * AFRL – (i) Air Force Research Laboratory * AFROTC – (i) Air Force Reserve Officer Training Corps * AFRRI – (i, U.S.) Armed Forces Radiobiology Research Institute * AFRTS – (i) Armed Forces Radio and Television Service * AFS (disambiguation), AFS ** (i) Active Front Steering ** Air Facility Sub-System ** Amniotic Fluid-derived Stem cell * AFS&A or AFSA (disambiguation), AFSA – (i) U.S. Air Force Studies and Analysis * AFSC (disambiguation), AFSC ** (i) U.S. Air Force Staff College (obsolete; replaced by Joint Forces Staff College, JFSC) ** U.S. Air Force Systems Command * AFSCN – (i) U.S. Air Force Satellite Control Network * AFSPC – (i) Air Force Space Command * AFT (disambiguation), AFT – American Farmland Trust * AFV (disambiguation), AFV – (i) armoured fighting vehicle * AFWA ** (a) Air Force Weather Agency ** Association of Fish and Wildlife Agencies

AG

* AG (disambiguation), ag – (s) Attogram * Ag – (s) Silver (Latin ''argentum'') * AG (disambiguation), AG ** (i) air gunner ** ''Aktiengesellschaft'' (German language, German, "incorporated") ** (s) Algeria (FIPS 10-4 country code) **

(ISO 3166 digram) ** Assemblies of God * AGA (disambiguation), AGA ** (a/i) AGA AB, AB Gas-accumulator ("ah-gah", Swedish company) ** Advanced Graphics Architecture * AGARD – (a) Advisory Group for Aerospace Research and Development * AGARDograph – (p) Advanced Guidance for Alliance Research and Development publication * AGASA – (a) Akeno Giant Air Shower Array (cosmic ray detector) * AGB (disambiguation), AGB – (i) Internal Nintendo initialism (''Advanced Game Boy'') for Game Boy Advance * AGC (disambiguation), AGC ** (i) Apollo Guidance Computer ** Automatic Gain Control * AGC (disambiguation), AGC – (i) Adjutant General's Corps (British Army) * AGDC (disambiguation), AGDC – (i) Australian Game Developers' Conference * AGI (disambiguation), AGI – (i) Auxiliary Group Intelligence * AGL (disambiguation), AGL – (i) Above Ground Level * AGM (disambiguation), AGM – (i) Annual General Meeting * AGN (disambiguation), AGN – (i) Active Galactic Nucleus * AGO (disambiguation), AGO – (s) Angola (ISO 3166 trigram) * AGP (disambiguation), AGP – (i) Accelerated Graphics Port * AGRICOLA – (a) Agriculture Online Access * AGS (disambiguation), AGS – (i) Alaska Ground Station (LandSat) * AGTS – (i) Advanced Gunnery Training System * AGU (disambiguation), AGU – (i) American Geophysical Union * AGW (disambiguation), AGW – (i) Autonomous Guided Weapon

AH

* AH (disambiguation), aH – (s) Attohenry * AH (disambiguation), Ah – (s) Ampere hour * AH (disambiguation), AH – (i) Attack Helicopter * AHA (disambiguation), AHA – (i) American Heart Association * AHCPR – (i) Agency for Health Care Policy and Research (obsolete; replaced with AHRQ) * AHEC (disambiguation), AHEC – (i) Australian Health Ethics Committee * AHPCRC – (i) Army High Performance Computing Research Center * AHQ – Air Headquarters * AHRQ – (i) Agency for Healthcare Research and Quality * AHS (disambiguation), AHS – (i) American Housing Survey

AI

* Ai (disambiguation), AI ** (i) Air Interdiction ** Amnesty International ** Artificial insemination, Artificial Insemination ** Artificial intelligence, Artificial Intelligence ** (s) Anguilla (ISO 3166 digram) * AIA (disambiguation), AIA ** (i) Aerospace Industries Association ** American Institute of Architects ** (s) Anguilla (ISO 3166 trigram) * AIAA – (i) American Institute of Aeronautics and Astronautics * AIC (disambiguation), AIC ** (i) African Independent Church ** Animal Identification Coordinator * AICD (disambiguation), AICD – (i) Australian Institute of Company Directors * AICMFP – (i) And I claim my five pounds, And I Claim My Five Pounds * AID (disambiguation), AID – (i) U.S. Agency for International Development * AIDS – (a) Acquired Immune Deficiency Syndrome * AIHW – Australian Institute of Health and Welfare * AIM (disambiguation), AIM – many, including AOL Instant Messenger, Australian Institute of Management; ''see entry'' * AIMP – (i) Aurora Incremental Modernization Project * AIPAC – (i) American Israel Public Affairs Committee * Air (disambiguation), AIR – (i) Aircraft Inventory Record * AIRFA – (a) American Indian Religious Freedom Act * AIRS (disambiguation), AIRS – (a/i) Aerometric Information Retrieval System (obsolete; replaced with AFS (disambiguation), AFS) * AIS (disambiguation), AIS ** (i) Australian Institute of Sport ** Automatic Identification System * AISB (disambiguation), AISB – (i) (British Society for the Study of) Artificial Intelligence and the Simulation of Behaviour

AJ

* AJ (disambiguation), aJ – (s) Attojoule * AJ (disambiguation), AJ – (s) Azerbaijan (FIPS 10-4 country code) * Ajax (programming), Ajax – (a) Asynchronous JavaScript And XML * AJD (disambiguation), AJD – (i) Astronomical Julian day * AJP (disambiguation), AJP – (i) Allied Joint Publication * AJPW – (i) All Japan Pro Wrestling

AK

* AK (disambiguation), ak – (s) Akan languages (ISO 639-1 code) * AK (disambiguation), aK – (s) Attokelvin * AK (disambiguation), AK – (s) Alaska (postal symbol) * Aka (disambiguation), aka – (s) Akan languages (ISO 639-2 code) * a.k.a. – (i) Also known as (i.e.: pseudonym, alias) * AKA – (i) Above knee amputation (orthopaedic usage) * AKDT – (p) Alaska Time Zone, Alaska Standard Daylight Saving Time (UTC−8 hours) * AKST – (p) Alaska Time Zone, Alaska Standard Time (UTC−9 hours) * AKP – (i) ''Justice and Development Party (Turkey), Adalet ve Kalkınma Partisi'' (Turkish language, Turkish, "Justice and Development Party")

AL

* AL (disambiguation), aL – (s) Attolitre * AL (disambiguation), Al – (s) Aluminium * AL (disambiguation), AL ** (s) Alabama (postal symbol) ** Albania (FIPS 10-4 country code; ISO 3166 digram) ** (i) ''Anno Lucis'' (Latin, "Year of Light", in Freemasonry, Masonic tradition, most often seen on plaques bearing the founding dates of buildings, in years AD and years AL) * ALA (disambiguation), ALA – (s) Åland (ISO 3166 trigram) * ALAP – (a) As Long/Late As Possible * ALARM – (a) Air-Launched Anti-Radar Missile * ALB (disambiguation), ALB – (s) Albania (ISO 3166 trigram) * ALCOA or Alcoa – The Aluminum Company of America, NYSE:AA * ALD (disambiguation), ALD – (i) Accounting Line Designator (nuclear weapon targeting) * ALERT – (a) Advanced Linked Extended Reconnaissance and Targeting – Attack and Launch Early Reporting to Theatre * ALF (disambiguation), ALF ** (a) Africa Leadership Forum ** Alien Life Form (cf. ALF (TV series), ''ALF'' (TV series)) ** Animal Liberation Front * ALG (disambiguation), ALG – (s) Algeria (IOC and FIFA trigram, but not ISO 3166) * ALGOL – (p) ALGOL programming language, ALGOrithmic Language * All (disambiguation), ALL – (s) Albanian lek (ISO 4217 currency code) * ALOA – (i) Associated Locksmiths of America, Inc. * ALOC (disambiguation), ALOC ** (a) Air Lines Of Communication ** (a) Average Length of Calls * Australian Labor Party, ALP – (i) Australian Labor Party * ALPA (disambiguation), ALPA – (a) Air Line Pilots Association, International, Air Line Pilots Association * ALS – (i) Amyotrophic Lateral Sclerosis – Automatic Landing System * ALSHS – (a) Abraham Low Self-Help Systems * ALSP – (i) Aggregate Level Simulation Protocol * ALTE (disambiguation), ALTE – (a) Association of Language Testers in Europe * ALTACS – (p) Automated decision Logic Tactical Air Combat Simulation

AM

* AM (disambiguation), am ** (s) Amharic language (ISO 639-1 code) ** Attometre * AM (disambiguation), Am – (s) Americium * AM (disambiguation), AM ** many, including Amplitude Modulation and ''12-hour clock, Ante Meridiem''; ''see entry'' ** (s) Armenia (FIPS 10-4 country code; ISO 3166 digram) * AM1 – Airman, Airman 1st class * AMA (disambiguation), AMA ** (i) American Medical Association ** Australian Medical Association * AMAPS – (a) Aircraft, Missile, Avionics Performance Simulation * AMC (disambiguation), AMC ** (i) Adaptive modulation and coding (digital communications) ** U.S. Air Mobility Command ** American Motors Corporation ** AMC (TV network), American Movie Classics (TV network; now known simply by the initials) ** U.S. Army Materiel Command * AMCB – (i) U.S. Army/Marine Corps Board * AMD ** (i) Advanced Micro Devices ** Age-related Macular Degeneration ** (s) Armenian dram (ISO 4217 currency code) * AMF (disambiguation), AMF – (i) Afghan Military Force(s) * AMFOM – (i) Advanced Missile Fly Out Model ("am-fomm") * AMFR ** (i) Age-specific Marital Fertility Rate ** Amplitude Modulation Following Response * AMFRS ** (i) Advanced Multi-Function Radio Frequency System ** Automatic Multisensor Feature-based Recognition System * AMH (disambiguation), amh – (s) Amharic language (ISO 639-2 code) * AML (disambiguation), AML – (i) Acute Myeloid Leukaemia * AMLCD – (i) Active Matrix Liquid Crystal Display * AMLO ** (i) Andrés Manuel López Obrador (Mexican politician) ** Anti-Money Laundering Office — separate government agencies in Anti-Money Laundering Office, Executive Yuan, Taiwan and Anti-Money Laundering Office (Thailand), Thailand * AMO (disambiguation), AMO – (i) Atlantic Multidecadal Oscillation * AMOLED – (i) Active-matrix organic light-emitting diode * AMOS ** (a) Advanced Mortar System, Advanced MOrtar System ** Air Force Maui Optical and Supercomputing observatory * AMP (disambiguation), AMP ** (i) Adenosine MonoPhosphate ** Automated Mission Planner ** Anak ng Puta ** (i) Ain't My Problem * AMRAAM – (a) Advanced Medium-Range Air-to-Air Missile * AMRDEC – (i) U.S. Aviation & Missile Research, Development, & Engineering Center * AMS (disambiguation), AMS ** (i) Agriculture Marketing Service ** American Mathematical Society * AMSAA – (i/a) U.S. Army Materiel Systems Analysis Activity * AMSB – (i) Aix Maurienne Savoie Basket (French basketball club) * AMSO (disambiguation), AMSO – (i/a) U.S. Army Model and Simulation Office * AMSU – Advanced Microwave Sounding Unit * AMTE – (i) UK Admiralty Marine Technology Establishment (1977–1984)

AN

* AN (disambiguation), an – (s) Aragonese language (ISO 639-1 code) * AN (disambiguation), aN – (s) Attonewton * AN (disambiguation), AN ** (s)

(FIPS 10-4 country code) ** Netherlands Antilles (ISO 3166 digram) * ANA (disambiguation), ANA ** (i) Administration for Native Americans ** Afghan National Army ** All Nippon Airways ** Anti-Nuclear Anti-body ** (a) Australian National Airways ** Australian Natives' Association * ANC (disambiguation), ANC – (i) African National Congress * And (disambiguation), AND – (s)

(ISO 3166 trigram) * ANFO – (i) ANFO, Ammonium nitrate/fuel oil (explosive) * ANG (disambiguation), ANG ** (i) Air National Guard ** (s) Angola (IOC and FIFA trigram, but not ISO 3166) ** (s) Netherlands Antillian guilder (ISO 4217 currency code) * ANGLiCo – (p) Air/Naval Gunfire Liaison Company * ANL (disambiguation), ANL – (i) Argonne National Laboratory * ANM (disambiguation), ANM – (i) Acoustic Noise Monitor * ANOVA – (p) ANalysis Of VAriance * ANS (disambiguation), ANS – (i) Applied and Natural Sciences * ANSI – (a) American National Standards Institute * ANTM – (i) ''America's Next Top Model'' * Ant (disambiguation), ANT ** (s) Netherlands Antilles (ISO 3166 trigram) **

(IOC trigram, but not ISO 3166 or FIFA) * ANTY – Acronyms, No Thank You * ANWR – (i) Arctic National Wildlife Refuge * ANZ (disambiguation), ANZ – (s) Australia and New Zealand Banking Group * ANZAC – (a) Australian and New Zealand Army Corps

AO

* AO (disambiguation), AO ** (s) Angola (FIPS 10-4 country code; ISO 3166 digram) ** (i) Approach Officer (submarine) ** Area of Operations * AOA (disambiguation), AOA ** (i) Air Officer in charge of Administration ** Argonne National Laboratory ** (s) Angolan kwanza (ISO 4217 currency code) ** (i) Award Of Arms (heraldry) ** Angle of attack, Angle of Attack (fluid dynamics) * AOC (disambiguation), AOC ** (i) Air Operations Centre ** Air Officer Commanding ** Alexandria Ocasio-Cortez (American politician) * AOC in C – Air Officer Commanding in Chief * AOD – (i) Adrenalin O.D. (punk rock band) * AOE – Area of Effect * AOI (disambiguation), AOI ** (i) Angle of incidence (disambiguation), Angle Of Incidence ** Arab Organization for Industrialization * AOL – (i) America OnLine * AOR (disambiguation), AOR – (i) Area of Responsibility * AOSTH – (i) ''Adventures of Sonic the Hedgehog'' * AOTS – (i) ''Attack of the Show!'' * AOU (disambiguation), AOU – (i) American Ornithologists' Union

AP

* AP (disambiguation), AP ** (i) Advanced Placement Program, Advanced Placement ** Air Publication ** (s) Andhra Pradesh (Indian state code) ** (s) Armed Forces Pacific (postal symbol) ** (i) Associated Press ** Auto Pilot * APA (disambiguation), APA – ** (i) Acolytes Protection Agency (professional wrestling tag team) ** American Psychiatric Association ** American Psychological Association (see also APA style, a writing format developed by this body) * APB (disambiguation), APB – (i) All points bulletin, All Points Bulletin (police jargon) * APC (disambiguation), APC ** (i) Armoured Personnel Carrier ** Armour Piercing Capped (ammunition) * APEC – (a) Asia Pacific Economic Cooperation * APCNR – (i) Armour-Piercing, Composite Non-Rigid (ammunition) * APCR (disambiguation), APCR – (i) Armour-Piercing, Composite Rigid (ammunition) * APDS (disambiguation), APDS – (i) Armour-Piercing, Discarding-Sabot (ammunition) * APEDS – (a) AMSAA Performance Estimates Data System * APEX (disambiguation), APEX – (p) Applied Physics Express * APFSDS – (i) Armour-Piercing, Fin-Stabilised, Discarding Sabot (ammunition) * APHA – (i) American Public Health Association * APHE – (i) Armour-Piercing, High Explosive (ammunition) * APHIS – (a) Animal and Plant Health Inspection Service * API – (i) Application Programming Interface * APL (disambiguation), APL ** (i) A Programming Language ** Acute Promyeloid Leukaemia ** Anti-Personnel Landmine ** Applied Physics Laboratory (Johns Hopkins University) * APM (disambiguation), APM – (i) Advanced Power Management * APNP – Certification, Licensure, and Credentialing for the New Nurse Practitioner in Wisconsin#Licensure, Advanced Practice Nurse Prescriber * APOD – (i) Aerial Port (Airport) Of Debarkation * APOE (disambiguation), APOE – (i) Aerial Port (Airport) Of Embarkation * Apache Point Observatory Lunar Laser-ranging Operation, APOLLO – (a) Apache Point Observatory Lunar Laser-ranging Operation * APP (disambiguation), APP – (i) Allied Procedural Publication * APR (disambiguation), APR – (i) Annual Percentage Rate * APS (disambiguation), APS ** (i) Advanced Photo System (cf. APS-C, an image sensor format based on the size of the original APS film frame) ** American Physical Society ** Antiphospholipid Antibody Syndrome

AQ

* AQ (disambiguation), AQ ** (i) AdventureQuest ** (s) American Samoa (FIPS 10-4 territory code) ** Antarctica (ISO 3166 digram) ** (i) Power Five conferences, Automatic qualifier, a term used by U.S. sports media from 1998 to 2013 to refer to the six conferences whose champions automatically entered the now-defunct Bowl Championship Series of college football * AQIM – (i) Al-Qaeda in the Islamic Maghreb * AQPS – (i) ''Autre que pur-sang'' (French: "Other than Thoroughbred"), designation of a type of French racehorse

AR

* AR (disambiguation), ar – (s) Arabic language (ISO 639-1 code) * AR (disambiguation), Ar – (s) Argon * AR (disambiguation), AR ** (s) Argentina (FIPS 10-4 country code; ISO 3166 digram) ** Arkansas (postal symbol) ** (i) List of ArmaLite rifles, ArmaLite Rifle (cf. ArmaLite AR-15 and AR-15 style rifle, both also referred to with the "AR" initialism) ** Armour ** (s) Arunachal Pradesh (Indian state code) * ARA (disambiguation), ara – (s) Arabic language (ISO 639-2 code) * ARAG (disambiguation), ARAG – (a) Advanced Research and Assessment Group * ARB (disambiguation), ARB – (i) Administrative Review Board * ARBA (disambiguation), ARBA – (a/i) Army Review Boards Agency * ARC (disambiguation), ARC ** (i) Appalachian Regional Commission ** Arc-second Raster Chart ** (a) Association of Retarded Citizens, the original name of the organization now known as Arc of the United States ** (i) Athletics–Recreation Center, an indoor arena at Valparaiso University * ARCA (disambiguation), ARCA – (a) Automobile Racing Club of America * ARCENT – (p) United States Army Central Command * Arda (disambiguation), ARDA – (a) Advanced Research and Development Activity (became DTO (disambiguation), DTO 2006) * ARE (disambiguation), ARE ** (i) UK Admiralty Research Establishment (1984–1991) ** (s) United Arab Emirates (ISO 3166 trigram) * ARF (disambiguation), ARF – (i) ASEAN Regional Forum * ARG (disambiguation), arg – (s) Aragonese language (ISO 639-2 code) * ARG (disambiguation), ARG – (s) Argentina (ISO 3166 trigram) * ARH (disambiguation), ARH – (s) Armed Reconnaissance Helicopter * ARI (disambiguation), ARI ** (i) Acute Respiratory Infection ** U.S. Army Research Institute for the Behavioral and Social Sciences * ARL (disambiguation), ARL ** (i) UK Admiralty Research Laboratory (1921–1977) ** U.S. Army Research Laboratory ** UIUC Aviation Research Laboratory * ARM ** (a) ARM architecture, Acorn RISC Machine, later Advanced RISC Machine (cf. Arm Ltd.) ** Anti-Radiation Missile ** Adjustable-rate mortgage ** (s) Armenia (ISO 3166 trigram) * ARNet – (p) Acquisition Reform Network *AROTS – Australian Rare Or Threatened Species * ARP (disambiguation), ARP – (i) Address Resolution Protocol – Applied Research Programme * ARPA (disambiguation), ARPA – (a) Advanced Research Projects Agency * ARRC (disambiguation), ARRC – (i) Allied Command Europe, ACE Rapid Reaction Corps * ARRF – (i) Allied Rapid Reaction Force * ARRL – (i) American Radio Relay League * Ars (disambiguation), ARS ** (i) Agricultural Research Service ** (s) Argentine peso (ISO 4217 currency code) * ARSC (disambiguation), ARSC – (i) Arctic Region Supercomputing Center * ARSPACE – (p) U.S. Army Space Command * ART (disambiguation), ART ** (a) Adaptive Resonance Theory ** Anti-Retroviral Therapy * ARTCC – (i) Air Route Traffic Control Center * ARWG – (i) Army Research Working Group ("are-wig")

AS

* AS (disambiguation), as ** (i) Adult swim ** (s) Assamese language (ISO 639-1 code) ** Attosecond * AS (disambiguation), aS – (s) Attosiemens * AS (disambiguation), As – (s) Arsenic * AS (disambiguation), AS ** (s) American Samoa (postal symbol; ISO 3166 digram) ** Australia (FIPS 10-4 country code) ** Assam / Asom (Indian state code) * AS (disambiguation), AS – (i) ActionScript * AS (disambiguation), A/S – (i) Anti-submarine * A&S (disambiguation), A&S – (i) Armament & Standardisation * ASA (disambiguation), ASA ** (i) Salicylic acid, AcetylSalicylic Acid ** American National Standards Institute, American Standards Association ** Army Security Agency ** Atlantic Southeast Airlines * ASAP (disambiguation), ASAP – (a) As Soon As Possible * ASARS ** (a) Advanced Synthetic Aperture Radar System ** Airborne Search and Rescue System * ASB (disambiguation), ASB – (i) Associated Student Body – Alternative Service Book (Church of England) * asbl – (i) ''association sans but lucratif'' (French language, French "Non-profit organisation") * ASBO – (a) Antisocial Behavior Order * ASCAP – (a) American Society of Composers, Authors, and Publishers * ASCC (disambiguation), ASCC ** (i) Army Service Component Commander ** Harvard Mark I, Automatic Sequence Controlled Calculator ** NATO reporting name, Air Standardization Coordinating Committee * ASCIET – (i) All Services Combat Identification Evaluation Team * ASCII – (a) American Standard Code for Information Interchange * ASC+T – (i) Anti Slip Control + Traction * ASD (disambiguation), ASD ** (i) (U.S.) Assistant Secretary of Defense ** Autism spectrum disorder * ASD(C3I) – (i) (U.S.) (Command, Control, Communications, & Intelligence) * ASD(FMP) – (i) (U.S.) Assistant Secretary of Defense (Force Management Policy) * ASD(HA) – (i) (U.S.) Assistant Secretary of Defense (Health Affairs) * ASD(ISA) – (i) (U.S.) Assistant Secretary of Defense (International Security Affairs) * ASD(ISP) – (i) (U.S.) Assistant Secretary of Defense (International Security Policy) * ASD(LA) – (i) (U.S.) Assistant Secretary of Defense (Legislative Affairs) * ASD(PA) – (i) (U.S.) Assistant Secretary of Defense (Public Affairs) * ASD(RA) – (i) (U.S.) Assistant Secretary of Defense (Reserve Affairs) * ASD(SO&HA) – (i) (U.S.) Assistant Secretary of Defense (Special Operations & Humanitarian Assistance) * ASD(SO/LIC) – (i) (U.S.) (Special Operations & Low-Intensity Conflict) * ASD(S&R) – (i) (U.S.) Assistant Secretary of Defense (Strategy & Requirements) * ASD(S&TR) – (i) (U.S.) Assistant Secretary of Defense (Strategy & Threat Reduction) * ASDIC – (a) Allied Submarine Detection Investigation Committee (Sonar) * ASEAN – (a) Association of Southeast Asian Nations * ASFAR – (a) Americans for a Society Free of Age Restrictions * ASG (disambiguation), ASG – (i) Area Support Group * ASIC – (a) Australian Securities and Investments Commission – (a) Aviation Security Identification Card * ASICS – (a) ''Anima sana in corpore sano'' (Latin, "A sound mind in a sound body") (athletic shoe manufacturer) * ASIO (disambiguation), ASIO ** (a) Australian Security Intelligence Organisation ** Audio Stream Input/Output * ASIP ** (i) Advanced System Improvement Program ** Army Stationing and Installation Plan ** Application-specific instruction set processor * ASL ** (i) Above Sea Level ** American Sign Language (also known as ''Ameslan'') ** "Age, Sex, Location?" (Internet slang) * ASM (disambiguation), asm – (s) Assamese language (ISO 639-2 code) * ASM (disambiguation), ASM ** (i) Air-to-surface missile, Air-to-Surface Missile ** (s) American Samoa (ISO 3166 trigram) ** (i) American Society for Metals ** American Society for Microbiology ** ''Association Sportive Montferrandaise'' (French language, French, "Clermont-Ferrand Sporting Association"), as in ASM Clermont Auvergne * ASMB ** (i) American Society for Matrix Biology ** Adult Swim Message Board * ASME ** (i) American Society of Mechanical Engineers ** American Society of Magazine Editors * ASMP (disambiguation), ASMP ** (i) ''Air-Sol Moyenne Portée'' missile (French "Medium-range air to surface") ** (p) Asymmetric multiprocessing * ASMR – Autonomous Sensory Meridian Response * ASN (disambiguation), ASN – (i) Associate of Science in Nursing * ASOC (disambiguation), ASOC ** (a/i) Air Sovereignty Operations Centre ** Air Support Operations Centre ** Airport Security and Operations Centre ** Antarctic and Southern Ocean coalition (ASOC), Antarctic and Southern Ocean Coalition ** Atlanta Symphony Orchestra, Atlanta Symphony Orchestra Chorus ** Australian Standard Offence Classification * ASP (disambiguation), ASP ** (i) Active Server Pages ** American Society of Primatologists ** Ammunition Supply Point ** Application Service Provider (cf internet service provider) ** Astronomical Society of the Pacific ** Association of Surfing Professionals * ASPI (disambiguation), ASPI – (i) Australian Strategic Policy Institute * ASR (disambiguation), ASR ** (i) Alkali-silica reaction ** Anti Slip Regulation * ASRAAM – (a) Advanced Short-Range Air-to-Air Missile * ASSC (disambiguation), ASSC – (i) Association for the Scientific Study of Consciousness * Ass Paym – Assistant Paymaster * AST (disambiguation), AST – (i) Atlantic Standard Time (UTC−4 hours) * ASTIA – (a) Armed Services Technical Information Agency * ASTM – (i) American Society for Testing and Materials * ASTREA (disambiguation), ASTREA – (a) ASTREA (air support unit), Aerial Support To Regional Enforcement Agencies (sheriff's air support unit) * ASUN – (p) Atlantic Sun Conference, now branded as the ASUN Conference (pronounced "A-sun") * ASUW (disambiguation), ASUW – (p) AntiSUrface Warfare * ASVAB–Armed Services Vocational Aptitude Battery (taken by juniors in high school in the USA) * ASVEL – (a) ASVEL Basket, Association Sportive Villeurbanne Éveil Lyonnais (''Association Sportive'' is French for "Sporting Association"; the club was founded through the merger of AS Villeurbanne and Éveil Lyonnais) * ASW (disambiguation), ASW – (i) AntiSubmarine Warfare * ASWORG – (i) (U.S.) AntiSubmarine Warfare Operations Research Group * ASX (disambiguation), ASX ** (p) Advanced Stream Redirector ** Australian Securities Exchange

AT

* AT (disambiguation), aT – (s) Attotesla * AT (disambiguation), At – (s) Astatine * AT (disambiguation), AT – (i) Anti-Tank – (s) Ashmore and Cartier Islands (FIPS 10-4 territory code) – Austria (ISO 3166 digram) – (i) Advanced Technology (IBM Personal Computer/AT) * ATA (disambiguation), ATA – (i) Advanced Technology Attachment (IBM Personal Computer) – Afghan Transitional Authority – Allen Telescope Array – (s) Antarctica (ISO 3166 trigram) * ATAC (disambiguation), ATAC – (a) Air Transportable Acoustic Communications * ATACMS – (p) Army TACtical Missile System * ATAPI – (a) Advanced Technology Attachment Packet Interface * ATAS (disambiguation), ATAS – (a) Air-To-Air FIM-92 Stinger, Stinger (missile) * ATAT (disambiguation), ATAT – (a) Aiken Tactical Airsoft Team / Star Wars vehicle * ATB ** (i) Active Time Battle ** (s) British Antarctic Territory (ISO 3166 trigram; merged with AQ (disambiguation), AQ in 1979) * ATC (disambiguation), ATC – ** (i) Air Traffic Control ** Air Training Corps ** U.S. Air Transport Command (United States Air Force), Air Transport Command (1942–1948) ** Athletic Trainer, Certified
www.nata.org
* ATCCIS – (i) Army Tactical Command and Control Information System * ATESS – (i) Aerospace and Telecommunications Engineering Support Squadron * ATF (disambiguation), ATF ** (s) French Southern Territories (ISO 3166 trigram) ** (i) (U.S.) Bureau of Alcohol, Tobacco, Firearms and Explosives (from its previous name, which did not include "Explosives") * ATG (disambiguation), ATG – (s)

(ISO 3166 and FIFA trigram) * ATGM – (i) Anti-Tank Guided Missile * ATGW – (i) Anti-Tank Guided Weapon * ATI (disambiguation), ATI – ** (i) Allied Telesyn International, Inc. ** (a) Array Technologies Incorporated. (ATI Technologies) ** Air Transport International - American cargo airline * Atisbo – a Local Government Area in Nigeria named for constituent communities (Ago-Are, Tede, Irawo, Sabe, Baasi, Ofiki and Owo) * ATK (disambiguation), ATK – (p) Attack * ATL (disambiguation), ATL – (p) Atlanta, Georgia, the largest city and capital of Georgia; taken from the IATA code for Hartsfield–Jackson Atlanta International Airport, its airport * ATLAS experiment, ATLAS – ** (a) All-Terrain Lifter Army System ** (p) Assessment Tool for LAnd Systems * ATM (disambiguation), ATM – ** (i) automated teller machine, Automated Teller Machine ** Asynchronous Transfer Mode ** At The Moment * ATN – (s) Dronning Maud Land (ISO 3166 trigram; merged with AQ (disambiguation), AQ in 1983) * ATO (disambiguation), ATO ** (i) Air Tasking Order ** Australian Taxation Office * ATP (disambiguation), ATP ** (i) Adenosine triphosphate, Adenosine TriPhosphate ** Allied Tactical Publication ** Ammunition Transfer Point ** Association of Tennis Professionals (cf. ATP Tour, ATP Challenger Tour, ATP Champions Tour) * ATSD – (p) (U.S.) United States Assistant Secretary of Defense, Assistant Secretary of Defense * ATSDR – (i) Agency for Toxic Substances and Disease Registry * American Telephone and Telegraph, AT&T – (i) American Telephone and Telegraph (U.S. company, also known as "Ma Bell") * ATV (disambiguation), ATV ** (i) All-terrain vehicle ** Associated Television – former UK TV company * ATWA – (a) Air, Trees, Water, Animals

AU

* AU (disambiguation), Au – (s) Gold (Latin ''Aurum'') * AU (disambiguation), AU – ** (i) African Union (was OAU before 2000) ** American University ** (s) Astronomical Unit ** Australia (ISO 3166 diagram) ** Austria (FIPS 10-4 country code) * AUC (disambiguation), AUC – ** (i) ''Ab Urbe Condita'' / ''Anno Urbis Conditae'' (Latin "from the founding of the city" / "in the year since the founding of the city") (of Rome) ** Area Under the Curve (concentration time curve; medicine) * AUD – (s) Australian dollar (ISO 4217 currency code) * AUS (disambiguation), AUS – (s) Australia (ISO 3166 trigram) * AUSCANNZUKUS – (p) Australia, Canada, New Zealand, United Kingdom, United States (security designation) * Auslan – (p) Australian Sign Language * AUT (disambiguation), AUT – (s) Austria (ISO 3166 trigram) * AUTL – (i) Army Universal Task List

AV

* AV (disambiguation), av – (s) Avar language (ISO 639-1 code) * AV (disambiguation), aV – (s) Attovolt * AV (disambiguation), Av – (i) Aperture priority, Aperture value (photographic mode) * AV (disambiguation), AV ** (s) Anguilla (FIPS 10-4 territory code) ** (i) Audio-Visual ** (s) Aviation * AVA (disambiguation), ava – (s) Avar language (ISO 639-2 code) * AVA (disambiguation), AVA – (i) American Viticultural Area * AVB (disambiguation), AVB – (i) Audio Video Bridging * AVCATT-A – (p) (U.S. Army's) Aviation Combed Arms Tactical Trainer-Aviation [Reconfigurable Manned Simulator] * AVDLR – (p) Aviation Depot Level Repair * ave – (s) Avestan language (ISO 639-2 code) * AVGP – (i) Armoured Vehicle, General Purpose * AVI (disambiguation), AVI – (i) Audio Video Interleave * AVIM – (p) Aviation Intermediate Maintenance * AVLB – (i) Armoured Vehicle Launched Body * AVM ** (i) Air Vice-Marshal ** (p) Arteriovenous malformation * AVO (disambiguation), AVO – (i) Apprehended Violence Order * AVP (disambiguation), AVP – (a) Arubaanse Volkspartij * AVP (disambiguation), AVP – (i) Association of Volleyball Professionals * Armoured Vehicle Royal Engineers, AVRE – (i) Armoured Vehicle Royal Engineers * AVTB ** (i) Armoured Vehicle Test Bed ** (p) Aviation Test Bed * AVUM – (p) Aviation Unit Maintenance * AVUS – (a) ''Automobil-Verkehrs- und Übungsstraße'' (German, "Automobile Traffic and Training Road"; former auto racing track and current road in Berlin) * AVVO – (a) Acute Vaginal Venereal Outbreak

AW

* AW (disambiguation), aW – (s) Attowatt * AW (disambiguation), AW – (s) Aruba (ISO 3166 digram) * AWA (disambiguation), AWA – (i) American Wrestling Association * Airborne early warning and control, AWACS – (a) Airborne Warning And Control System * AWC (disambiguation), AWC – (i) Air Warfare Centre * AWD (disambiguation), AWD – many, including all-wheel drive, All Wheel Drive; ''see entry'' * Awe (disambiguation), AWE – (i/a) Advanced Warfighting Experiment * AWG (disambiguation), AWG – (s) Aruban guilder (ISO 4217 currency code) * AWOL – (a) Absent Without Official Leave / Absent WithOut Leave (military jargon) * AWP (disambiguation), AWP – (p) Awaiting Parts (SM&R code) * AWSIM – (p) Air Warfare SIMulation * AWST (disambiguation), AWST – (a) Australian Western Standard Time * AWW (disambiguation), AWW – (i) Above-Water Warfare

AX

* AX (disambiguation), AX – (s) Åland (ISO 3166 digram) * AXP (disambiguation), AXP – (p) Ambulance eXchange Point

AY

* AY (disambiguation), ay – (s) Aymara language (ISO 639-1 code) * AY (disambiguation), AY – (s) Antarctica (FIPS 10-4 territory code) * AYBABTU – (i) All Your Base Are Belong To Us * AYM (disambiguation), aym – (s) Aymara language (ISO 639-2 code) * AYU – (i) As Yet Unknown

AZ

* AZ (disambiguation), az – (s) Azerbaijani language (ISO 639-1 code) * AZ (disambiguation), AZ ** (s) Arizona (postal symbol) ** Azerbaijan (ISO 3166 digram) ** (i) AZ Alkmaar, Alkmaar Zaanstreek (Dutch football club) * Azerbaijan Airlines, AZAL - Azerbaijan Airlines * AZE (disambiguation), aze – (s) Azerbaijani language (ISO 639-2 code) * AZE (disambiguation), AZE – (s) Azerbaijan (ISO 3166 trigram) * AZN (disambiguation), AZN – (s) Azerbaijani manat (ISO 4217 currency code) * AZUR (disambiguation), AZUR – (p) ''Actions en zone urbaine'' (French, Urban Operations) {{List of acronyms Lists of acronyms, Acronyms A