A three-letter acronym (TLA), or three-letter abbreviation, is an

abbreviation An abbreviation (from Latin ''brevis'', meaning ''short'') is a shortened form of a word or phrase, by any method. It may consist of a group of letters or words taken from the full version of the word or phrase; for example, the word ''abbrevia ...

consisting of three letters. These are usually the initial letters of the words of the phrase abbreviated, and are written in capital letters (upper case); three-letter ''abbreviations'' such as ''etc.'' and ''Mrs.'' are not three-letter ''acronyms'', but "TLA" is a TLA (an example of an autological abbreviation). Most three-letter abbreviations are not, strictly,

acronym An acronym is a word or name formed from the initial components of a longer name or phrase. Acronyms are usually formed from the initial letters of words, as in ''NATO'' (''North Atlantic Treaty Organization''), but sometimes use syllables, as ...

s, but rather

initialism An acronym is a word or name formed from the initial components of a longer name or phrase. Acronyms are usually formed from the initial letters of words, as in ''NATO'' (''North Atlantic Treaty Organization''), but sometimes use syllables, as ...

s: all the letters are pronounced as the names of letters, as in '' APA'' . Some are true acronyms, pronounced as a word: as with computed axial tomography, for example, CAT is almost always pronounced as the animal's name () in "CAT scan". Even the ''initialisms'' are however considered ''three-letter acronyms'', because that term appeared first in widespread use, and is overwhelmingly popular today.

Examples

* Countries: SRI, USA, CAR, UAE,

DRC The Democratic Republic of the Congo (french: République démocratique du Congo (RDC), colloquially "La RDC" ), informally Congo-Kinshasa, DR Congo, the DRC, the DROC, or the Congo, and formerly and also colloquially Zaire, is a country in ...

, etc. * Famous people:

FDR Franklin Delano Roosevelt (; ; January 30, 1882April 12, 1945), often referred to by his initials FDR, was an American politician and attorney who served as the 32nd president of the United States from 1933 until his death in 1945. As the ...

, JFK, MLK, OBL, RBG, RDJ and MJK * Computer phrases:

CPU A central processing unit (CPU), also called a central processor, main processor or just processor, is the electronic circuitry that executes instructions comprising a computer program. The CPU performs basic arithmetic, logic, controlling, a ...

DOS DOS is shorthand for the MS-DOS and IBM PC DOS family of operating systems. DOS may also refer to: Computing * Data over signalling (DoS), multiplexing data onto a signalling channel * Denial-of-service attack (DoS), an attack on a communicat ...

RAM Ram, ram, or RAM may refer to: Animals * A male sheep * Ram cichlid, a freshwater tropical fish People * Ram (given name) * Ram (surname) * Ram (director) (Ramsubramaniam), an Indian Tamil film director * RAM (musician) (born 1974), Dutch * ...

, ROM, and

GNU GNU () is an extensive collection of free software (383 packages as of January 2022), which can be used as an operating system or can be used in parts with other operating systems. The use of the completed GNU tools led to the family of operat ...

* File extensions:

JPG JPEG ( ) is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image ...

PDF Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1992 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems. ...

, and XLS * Corporations: BMW, IBM, AMD and

NEC is a Japanese multinational information technology and electronics corporation, headquartered in Minato, Tokyo. The company was known as the Nippon Electric Company, Limited, before rebranding in 1983 as NEC. It provides IT and network soluti ...

* Currency: USD,

GBP Sterling (abbreviation: stg; Other spelling styles, such as STG and Stg, are also seen. ISO code: GBP) is the currency of the United Kingdom and nine of its associated territories. The pound ( sign: £) is the main unit of sterling, and ...

, and CHF * Business:

CEO A chief executive officer (CEO), also known as a central executive officer (CEO), chief administrator officer (CAO) or just chief executive (CE), is one of a number of corporate executives charged with the management of an organization especially ...

, CFO and other

C-level Corporate titles or business titles are given to corporate officers to show what duties and responsibilities they have in the organization. Such titles are used by publicly and privately held for-profit corporations, cooperatives, non-profit or ...

officers * Three Letter Agencies:

CIA The Central Intelligence Agency (CIA ), known informally as the Agency and historically as the Company, is a civilian foreign intelligence service of the federal government of the United States, officially tasked with gathering, processing, ...

, FBI, CBI, FSB, and

NSA The National Security Agency (NSA) is a national-level intelligence agency of the United States Department of Defense, under the authority of the Director of National Intelligence (DNI). The NSA is responsible for global monitoring, collec ...

Television network A television network or television broadcaster is a telecommunications network for distribution of television program content, where a central operation provides programming to many television stations or pay television providers. Until the mid ...

s: ABC ( Aus., U.S.), BBC (UK), CBC (

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by to ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the n ...

), and NHK (Japan) *

Personal advertisement A personal advertisement, sometimes called a contact ad, is a form of classified advertising in which a person seeks to find another person for friendship, romance, marriage, or sexual activity. In British English, it is commonly known as an adve ...

s: SBM for Single Black Male, STR for Short Term Relationship * Chemistry, biology, pharmaceuticals:

GMO A genetically modified organism (GMO) is any organism whose genetic material has been altered using genetic engineering techniques. The exact definition of a genetically modified organism and what constitutes genetic engineering varies, with ...

, LSD and MSG * Religion: LDS, SBC and SDA * Clinical medicine:

CAD Computer-aided design (CAD) is the use of computers (or ) to aid in the creation, modification, analysis, or optimization of a design. This software is used to increase the productivity of the designer, improve the quality of design, improve c ...

and CHF * Communications shorthand:

LOL LOL, or lol, is an initialism for laughing out loud and a popular element of Internet slang. It was first used almost exclusively on Usenet, but has since become widespread in other forms of computer-mediated communication and even face-to ...

and OMG * Military and weaponry: BFR and RPG * Wars and political conflicts: HYW and WWI * IATA airport codes: LAX and LHR * Academic testing: ACT, SAT * Musical groups: R.E.M.,

XTC XTC were an English rock band formed in Swindon in 1972. Fronted by songwriters Andy Partridge (guitars, vocals) and Colin Moulding (bass, vocals), the band gained popularity during the rise of punk and new wave in the 1970s, later playing i ...

, TLC,

E.L.O. The Electric Light Orchestra (ELO) are an English rock band formed in Birmingham in 1970 by songwriters and multi-instrumentalists Jeff Lynne and Roy Wood with drummer Bev Bevan. Their music is characterised by a fusion of pop, classical ar ...

MC5 MC5, also commonly called The MC5, is an American rock band formed in Lincoln Park, Michigan, in 1963. The original line-up consisted of Rob Tyner (vocals) Wayne Kramer (guitar), Fred "Sonic" Smith (guitar), Michael Davis (bass), and Dennis ...

, GBH,

O.A.R. O.A.R. (short for Of A Revolution) is an American rock band, founded in 1996 in Rockville, Maryland. The band consists of lead vocalist/guitarist Marc Roberge, drummer Chris Culos, guitarist Richard On, bassist Benj Gershman, saxophonist/guitar ...

, MDC, D.R.I., JFA * Canine registries: AKC and CKC * Sports organizations: NFL,

MLB Major League Baseball (MLB) is a professional baseball organization and the oldest major professional sports league in the world. MLB is composed of 30 total teams, divided equally between the National League (NL) and the American League (AL), ...

, (North America);

AFL AFL may refer to: Sports * American Football League (AFL), a name shared by several separate and unrelated professional American football leagues: ** American Football League (1926) (a.k.a. "AFL I"), first rival of the National Football Leagu ...

and NRL (Australia); NPB (Japan); ACB, LFP (Spain);

IPL The Indian Premier League (IPL), also known as TATA IPL for sponsorship reasons, is a men's T20 franchise cricket league of India. It is annually contested by ten teams based out of seven Indian cities and three Indian states. The leagu ...

(India), EPL (England), WBO * Ship prefixes: HMS, USS and RMS * State postal abbreviations:

NSW ) , nickname = , image_map = New South Wales in Australia.svg , map_caption = Location of New South Wales in AustraliaCoordinates: , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , es ...

QLD ) , nickname = Sunshine State , image_map = Queensland in Australia.svg , map_caption = Location of Queensland in Australia , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , establishe ...

, VIC and TAS (Australia) * Political Parties:

BJP The Bharatiya Janata Party (BJP; ; ) is a political party in India, and one of the two major Indian political parties alongside the Indian National Congress. Since 2014, it has been the ruling political party in India under Narendra Mo ...

, CCP,

GOP The Republican Party, also referred to as the GOP ("Grand Old Party"), is one of the Two-party system, two Major party, major contemporary political parties in the United States. The GOP was founded in 1854 by Abolitionism in the United Stat ...

and AAP *Air Navigation Services (

ANS Ans or ANS or ''variation'', may refer to: Places * Ans, Belgium, a municipality in Belgium * Ans, Denmark, a village in Denmark * Angus, Scotland, UK; a council area by its Chapman code * Ainsdale railway station, England, UK (by station code ...

SAR SAR or Sar may refer to: Places * Sar (river), Galicia, Spain * Sar, Bahrain, a residential district * Sar, Iran (disambiguation), several places in Iran * Sar, Tibet, Tibet Autonomous Region of China * Šar Mountains, in southeastern Europe ...

AIS AIS may refer to: Medicine * Abbreviated Injury Scale, an anatomical-based coding system to classify and describe the severity of injuries * Acute ischemic stroke, the thromboembolic type of stroke * Androgen insensitivity syndrome, an intersex ...

, FPC, ATM, MET, CNS, ASM, ATS, ATC,

FIS FIS or fis may refer to: Science and technology * '' Fis'', an ''E. Coli'' gene * Fis phenomenon, a phenomenon in linguistics * F♯ (musical note) * Flight information service, an air traffic control service * Frame Information Structure, a Se ...

History and origins

The exact phrase ''three-letter acronym'' appeared in the sociology literature in 1975. Three-letter acronyms were used as

mnemonic A mnemonic ( ) device, or memory device, is any learning technique that aids information retention or retrieval (remembering) in the human memory for better understanding. Mnemonics make use of elaborative encoding, retrieval cues, and imag ...

s in biological sciences, from 1977 and their practical advantage was promoted by Weber in 1982. They are used in many other fields, but the term TLA is particularly associated with computing. In 1980, the manual for the Sinclair

ZX81 The ZX81 is a home computer that was produced by Sinclair Research and manufactured in Dundee, Scotland, by Timex Corporation. It was launched in the United Kingdom in March 1981 as the successor to Sinclair's ZX80 and designed to be a low-cos ...

home computer used and explained TLA. Steven Vickers ''ZX81 Basic Programming'', Sinclair Research Limited, page 161 "As you can see, everything has a three letter abbreviation (TLA)." The specific generation of three-letter acronyms in computing was mentioned in a JPL report of 1982.TDA Progress Report
R. Hull (1982) An Introduction to the new Productivity Information Management System page 176 In 1988, in a paper titled "On the Cruelty of Really Teaching Computing Science", eminent computer scientist Edsger W. Dijkstra wrote (disparagingly), "No endeavour is respectable these days without a TLA" By 1992 it was in a

Microsoft Microsoft Corporation is an American multinational technology corporation producing computer software, consumer electronics, personal computers, and related services headquartered at the Microsoft Redmond campus located in Redmond, Washin ...

handbook.

Combinatorics

The number of possible three-letter abbreviations using the 26 letters of the alphabet from A to Z (AAA, AAB ... to ZZY, ZZZ) is 26 × 26 × 26 = 17,576. An additional 26 × 26 × 10 = 6760 can be produced for each single position allowed to be a digit 0-9, such as

2FA Multi-factor authentication (MFA; encompassing two-factor authentication, or 2FA, along with similar terms) is an electronic authentication method in which a user is granted access to a website or application only after successfully presenting ...

P2P P2P may refer to: * Pay to play, where money is exchanged for services * Peer-to-peer, a distributed application architecture in computing or networking ** List of P2P protocols * Phenylacetone, an organic compound commonly known as P2P * Poin ...

, or

WW2 World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposing ...

, giving a total of 37,856 such three-character strings. In standard

English English usually refers to: * English language * English people English may also refer to: Peoples, culture, and language * ''English'', an adjective for something of, from, or related to England ** English national ide ...

WWW The World Wide Web (WWW), commonly known as the Web, is an information system enabling documents and other web resources to be accessed over the Internet. Documents and downloadable media are made available to the network through web se ...

is the TLA whose

pronunciation Pronunciation is the way in which a word or a language is spoken. This may refer to generally agreed-upon sequences of sounds used in speaking a given word or language in a specific dialect ("correct pronunciation") or simply the way a particular ...

requires the most syllables—typically nine. The usefulness of TLAs typically comes from its being quicker to say than the phrase it represents; however saying 'WWW' in English requires three times as many syllables as the phrase it is meant to abbreviate (World Wide Web). "WWW" is sometimes abbreviated to "dubdubdub" in speech.

References in popular culture

* As early as 1967, the musical Hair included the song "Initials", whose final verse consisted only of TLAs, viz: " LBJ IRT

USA The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...

LSD Lysergic acid diethylamide (LSD), also known colloquially as acid, is a potent psychedelic drug. Effects typically include intensified thoughts, emotions, and sensory perception. At sufficiently high dosages LSD manifests primarily mental, vi ...

. LSD LBJ

FBI The Federal Bureau of Investigation (FBI) is the domestic intelligence and security service of the United States and its principal federal law enforcement agency. Operating under the jurisdiction of the United States Department of Justice, t ...

. FBI CIA LSD LBJ." * In 1999, the author

Douglas Adams Douglas Noel Adams (11 March 1952 – 11 May 2001) was an English author and screenwriter, best known for ''The Hitchhiker's Guide to the Galaxy''. Originally a 1978 The Hitchhiker's Guide to the Galaxy (radio series), BBC radio comedy, ''The H ...

remarked: "The World Wide Web is the only thing I know of whose shortened form takes three times longer to say than what it's short for." * According to the Jargon File, a journalist once asked hacker

Paul Boutin Paul Boutin (born December 11, 1961 in Lewiston, Maine) is an American magazine writer and editor who writes about technology in a pop-culture context. Boutin, who began writing for ''Wired'' in 1997, wrote for ''The New York Times'' from 2003 ...

what he thought the biggest problem in computing in the 1990s would be. Paul's straight-faced response was: "There are only 17,000 three-letter acronyms." * The Jargon File also mentions the abbreviation "ETLA" for "extended three-letter acronym" to refer to four-letter acronyms/abbreviations. "Extended three-letter acronym" is sometimes abbreviated to "XTLA".TLA
jargon.net * In the comic strip

Dilbert ''Dilbert'' is an American comic strip written and illustrated by Scott Adams, first published on April 16, 1989. It is known for its satirical office humor about a white-collar, micromanaged office with engineer Dilbert as the title charact ...

the title character is working on a project called TTP. The initials stand for 'The TTP Project.' This is also an example of a

recursive acronym A recursive acronym is an acronym that refers to itself, and appears most frequently in computer programming. The term was first used in print in 1979 in Douglas Hofstadter's book '' Gödel, Escher, Bach: An Eternal Golden Braid'', in which Hofs ...

References

{{DEFAULTSORT:Three-letter Acronym Abbreviations T

Examples

History and origins

Combinatorics

References in popular culture

See also

References