AT or at may refer to:

Geography

Austria

Austria Austria, formally the Republic of Austria, is a landlocked country in Central Europe, lying in the Eastern Alps. It is a federation of nine Federal states of Austria, states, of which the capital Vienna is the List of largest cities in Aust ...

(ISO 2-letter country code) *

.at .at is the Internet country code top-level domain (ccTLD) for Austria. It is administered by nic.at. Second-level domains The .at top-level domain has a number of second-level domains: However, it is also possible to register directly at the to ...

, Internet country code top-level domain

United States

* Atchison County, Kansas (county code) * The

Appalachian Trail The Appalachian Trail, also called the A.T., is a hiking trail in the Eastern United States, extending almost between Springer Mountain in Georgia and Mount Katahdin in Maine, and passing through 14 states.Gailey, Chris (2006)"Appalachian Tra ...

(A.T.), a 2,180+ mile long mountainous trail in the Eastern United States

Elsewhere

Antigua and Barbuda Antigua and Barbuda is a Sovereign state, sovereign archipelagic country composed of Antigua, Barbuda, and List of islands of Antigua and Barbuda, numerous other small islands. Antigua and Barbuda has a total area of 440 km2 (170 sq mi), ...

, World Meteorological Organization country code *

Ashmore and Cartier Islands The Territory of Ashmore and Cartier Islands is an uninhabited Australian States and territories of Australia#External territories, external territory consisting of four low-lying tropical islands in two separate reefs (Ashmore and Cartier), ...

(FIPS 10-4 territory code, and obsolete NATO country code) * At, Bihar, village in Aurangabad district of Bihar, India *

Province of Asti The province of Asti (; Piedmontese language, Piedmontese: ''provincia d'Ast'') is a Provinces of Italy, province in the Piedmont region of Italy. Its capital is the city of Asti. To the northwest it borders on the Metropolitan City of Turin; ...

, Italy (ISO 3166-2:IT code) *

Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...

, LOC MARC code

Politics

* Awami Tahreek a left-wing Pakistani political party

Science and technology

Computing

* @ (or "

at sign The at sign () is an accounting and invoice abbreviation meaning "at a rate of" (e.g. 7 Widget (economics), widgets @ £2 per widget = £14), now seen more widely in email addresses and social media platform User (computing), handles. It is norm ...

"), the punctuation symbol now typically used in e-mail addresses and tweets) *

at (command) at is a shell command for scheduling commands to be executed at a future time; once. The command was developed for Unix and is available on Unix and Unix-like systems, Windows, and ReactOS. Variants Unix-like On Unix-like operating systems, ...

, used to schedule tasks or other commands to be performed or run at a certain time *

IBM Personal Computer/AT The IBM Personal Computer AT (model 5170, abbreviated as IBM AT or PC/AT) was released in 1984 as the fourth model in the IBM Personal Computer line, following the IBM PC/XT and its IBM Portable PC variant. It was designed around the Intel 8 ...

AT (form factor) In the era of IBM compatible personal computers, the AT form factor comprises the dimensions and layout (Comparison of computer form factors, form factor) of the motherboard for the IBM AT. Baby AT motherboards are slightly smaller, measuring 8. ...

for motherboards and computer cases ** AT connector, a five-pin

DIN connector The DIN connector is an electrical signal connector that was standardized by the (DIN), the German Institute for Standards, in the mid 1950s, initially with three pins for mono, but when stereo connections and gear appeared in the late 1950s, v ...

for a keyboard *

AT Protocol The AT Protocol (Authenticated Transfer Protocol, pronounced " @ protocol" and commonly shortened to ATProto) is a protocol and open standard for distributed social networking services. It is under development by Bluesky Social PBC, a public ...

, a decentralized social networking protocol by

Bluesky Bluesky is a microblogging social media social networking service, service. Users can share short posts containing text, images, and videos. It is owned by Bluesky Social PBC, a benefit corporation based in the United States. Bluesky was dev ...

* The

Hayes command set The Hayes command set (also known as the AT command set) is a specific command language originally developed by Dale Heatherington and Dennis Hayes for the Hayes Smartmodem in 1981. The command set consists of a series of short text string ...

for computer modems (each command begins with the character string "AT")

Biology and medicine

Anaerobic threshold Lactate inflection point (LIP) is the exercise intensity at which the blood concentration of lactate and/or lactic acid begins to increase rapidly. It is often expressed as 85% of maximum heart rate or 75% of maximum oxygen intake. When exercisin ...

, in physiology * ''Análisis transaccional'' (Spanish for "

transactional analysis Transactional analysis is a psychoanalytic theory and method of therapy wherein social interactions (or "transactions") are analyzed to determine the id, ego, and superego, ego state of the communicator (whether parent-like, childlike, or adult- ...

"), a psychological method * Antithrombin, a small protein molecule *

Ataxia–telangiectasia Ataxia–telangiectasia (AT or A–T), also referred to as ataxia–telangiectasia syndrome or Louis–Bar syndrome, is a rare, neurodegenerative disease causing severe disability. Ataxia refers to poor coordination and telangiectasia to small dil ...

, an immunodeficiency disorder *

Athletic training Athletic training is an Allied health professions, allied health care profession recognized by the American Medical Association (AMA)"What is an Athletic Trainer?". The Board of Certification Website. 2003. Athletic training is also recogniz ...

Atrial tachycardia Atrial tachycardia is a type of heart rhythm problem in which the heart's electrical impulse comes from an ectopic pacemaker (that is, an abnormally located cardiac pacemaker) in the upper chambers ( atria) of the heart, rather than from the sin ...

Physics and chemistry

Astatine Astatine is a chemical element; it has Symbol (chemistry), symbol At and atomic number 85. It is the abundance of elements in Earth's crust, rarest naturally occurring element in the Earth's crust, occurring only as the Decay chain, decay product ...

(symbol At), a chemical element *

Ampere-turn The ampere-turn (symbol A⋅t) is the MKS system of units, MKS (metre–kilogram–second) unit of magnetomotive force (MMF), represented by a direct current of one ampere flowing in a single-turn loop. ''Turns'' refers to the winding number of an ...

(symbol A t), an International System of Units (MKS) unit of magnetomotive force *

Attotesla The tesla (symbol: T) is the unit of magnetic flux density (also called magnetic B-field strength) in the International System of Units (SI). One tesla is equal to one weber per square metre. The unit was announced during the General Confere ...

(symbol aT), 10⁻¹⁸ tesla, an SI derived unit of magnetic flux density *

Technical atmosphere Technical may refer to: * Technical (vehicle), an improvised fighting vehicle * Technical area, an area which a manager, other coaching personnel, and substitutes are allowed to occupy during a football match * Technical advisor, a person who ad ...

(symbol at), a physical unit of pressure

Other uses in science and technology

Acceptance testing In engineering and its various subdisciplines, acceptance testing is a test conducted to determine if the requirements of a specification or contract are met. It may involve chemical tests, physical tests, or performance tests. In systems ...

, in engineering *

Appropriate technology Appropriate technology is a movement (and its manifestations) encompassing technology, technological choice and application that is small-scale, affordable by its users, labor-intensive, efficient energy use, energy-efficient, environmentally sust ...

, an ideological movement to scale technology to be appropriate to its context *

Assistive technology Assistive technology (AT) is a term for assistive, adaptive, and rehabilitative devices for Disability, people with disabilities and the elderly. Disabled people often have difficulty performing activities of daily living (ADLs) independently, ...

, devices for people with disabilities *

Anti-tank warfare Anti-tank warfare refers to the military strategies, tactics, and weapon systems designed to counter and destroy enemy armored vehicles, particularly tanks. It originated during World War I following the first deployment of tanks in 1916, and ...

Automatic transmission An automatic transmission (AT) or automatic gearbox is a multi-speed transmission (mechanics), transmission used in motor vehicles that does not require any input from the driver to change forward gears under normal driving conditions. The 1904 ...

, in vehicles

Other uses

* At, a

preposition Adpositions are a part of speech, class of words used to express spatial or temporal relations (''in, under, towards, behind, ago'', etc.) or mark various thematic relations, semantic roles (''of, for''). The most common adpositions are prepositi ...

* At (cuneiform), a cuneiform sign * At, 1/100 of a Lao kip, a unit of currency * AT (), a Ukrainian form of company, equivalent to

joint-stock company A joint-stock company (JSC) is a business entity in which shares of the company's stock can be bought and sold by shareholders. Each shareholder owns company stock in proportion, evidenced by their shares (certificates of ownership). Shareho ...

* Aarne–Thompson classification system, used to classify folktales * Archive Team, a digital preservation group * Aliança da Terra, a Brazilian non-governmental organization *

Alternative Tentacles Alternative Tentacles is an independent record label established in 1979 by Dead Kennedys vocalist Jello Biafra and guitarist East Bay Ray in San Francisco, California, with the intention to release the Dead Kennedys' self-produced single " C ...

, an independent record label * Auckland Transport, New Zealand, a public transport agency *

Audiotool Audiotool is a free, browser-based music production software and distribution platform developed in Germany. It allows users to remix and collaborate on tracks in real-time. Users can create and publish their music tracks onto the site using Cre ...

, a

Digital audio workstation A digital audio workstation (DAW ) is an electronic device or application software used for Sound recording and reproduction, recording, editing and producing audio files. DAWs come in a wide variety of configurations from a single software pr ...

* Autolinee Toscane, Italy, a public transport agency * Aviation electronics technician (United States Navy), a job specialty *

Royal Air Maroc Royal Air Maroc (RAM, ; ; ) is the Morocco, Moroccan national carrier, as well as the country largest airline, ranking among the largest in Africa. RAM is wholly owned by the Cabinet of Morocco, Moroccan Government, and has its headquarters o ...

(IATA airline designator AT) * A US Navy hull classification symbol: Fleet tug (AT)