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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
An autological word (also called homological word) is a word that expresses a property that it also possesses (e.g., "word" is a word, "noun" is a noun, "English" is an English word, "wikt:pentasyllabic, pentasyllabic" has five syllables, and " ...
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
''The Animal'' is a 2001 American comedy film directed by Luke Greenfield, written by Rob Schneider and Tom Brady, and starring Schneider in the lead role, Colleen Haskell, John C. McGinley, Guy Torry, and Edward Asner. The film depicts a police ...
'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
Shri (; , ) is a Sanskrit term denoting resplendence, wealth and prosperity, primarily used as an honorific.
The word is widely used in South and Southeast Asian languages such as Marathi, Malay (including Indonesian and Malaysian), Javanes ...
,
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 ...
,
CAR,
UAE
The United Arab Emirates (UAE; ar, اَلْإِمَارَات الْعَرَبِيَة الْمُتَحِدَة ), or simply the Emirates ( ar, الِْإمَارَات ), is a country in Western Asia (The Middle East). It is located at th ...
,
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
John Fitzgerald Kennedy (May 29, 1917 – November 22, 1963), often referred to by his initials JFK and the nickname Jack, was an American politician who served as the 35th president of the United States from 1961 until his assassination i ...
,
MLK,
OBL,
RBG,
RDJ and
MJK
* Computer phrases:
CPU,
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
Rom, or ROM may refer to:
Biomechanics and medicine
* Risk of mortality, a medical classification to estimate the likelihood of death for a patient
* Rupture of membranes, a term used during pregnancy to describe a rupture of the amniotic sac
* ...
, 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,
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
Advanced Micro Devices, Inc. (AMD) is an American multinational semiconductor company based in Santa Clara, California, that develops computer processors and related technologies for business and consumer markets. While it initially manufactur ...
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
The United States dollar (symbol: $; code: USD; also abbreviated US$ or U.S. Dollar, to distinguish it from other dollar-denominated currencies; referred to as the dollar, U.S. dollar, American dollar, or colloquially buck) is the official ...
,
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 t ...
, 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
The chief financial officer (CFO) is an officer of a company or organization that is assigned the primary responsibility for managing the company's finances, including financial planning, management of financial risks, record-keeping, and financ ...
and other
C-level officers
* Three Letter Agencies:
CIA
The Central Intelligence Agency (CIA ), known informally as the Agency and historically as the Company, is a civilian intelligence agency, foreign intelligence service of the federal government of the United States, officially tasked with gat ...
,
FBI
The Federal Bureau of Investigation (FBI) is the domestic Intelligence agency, intelligence and Security agency, security service of the United States and its principal Federal law enforcement in the United States, federal law enforcement age ...
,
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, collecti ...
*
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 multichannel video programming distributo ...
s: ABC (
Aus.,
U.S.
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 ...
),
BBC #REDIRECT BBC #REDIRECT BBC
Here i going to introduce about the best teacher of my life b BALAJI sir. He is the precious gift that I got befor 2yrs . How has helped and thought all the concept and made my success in the 10th board exam. ...
...
(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 tot ...
,
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 north ...
), and
NHK
, also known as NHK, is a Japanese public broadcaster. NHK, which has always been known by this romanized initialism in Japanese, is a statutory corporation funded by viewers' payments of a television license fee.
NHK operates two terrestr ...
(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 adv ...
s: SBM for Single Black Male, STR for Short Term Relationship
* Chemistry, biology, pharmaceuticals:
GMO,
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 ...
and
MSG
Monosodium glutamate (MSG), also known as sodium glutamate, is the sodium Salt (chemistry), salt of glutamic acid. MSG is found naturally in some foods including tomatoes and cheese in this glutamic acid form. MSG is used in cooking as a fl ...
* Religion:
LDS
LDS may refer to:
Organizations
* LDS Hospital, Salt Lake City, Utah, US Religion
* Latter Day Saint movement (LDS movement), a collection of independent church groups
**The Church of Jesus Christ of Latter-day Saints, the largest group within t ...
,
SBC and
SDA
SDA or sda may refer to:
Educational institutions
* San Dieguito Academy, Encinitas, California, US
* SDA Bocconi School of Management, in Milan, Italy
Science and technology Biology
* Specific dynamic action, the thermic effect of food
* Str ...
* 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 co ...
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
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
*
IATA airport codes
An IATA airport code, also known as an IATA location identifier, IATA station code, or simply a location identifier, is a three-character alphanumeric geocode designating many airports and metropolitan areas around the world, defined by the ...
:
LAX
Los Angeles International Airport , commonly referred to as LAX (with each letter pronounced individually), is the primary international airport serving Los Angeles, California and its surrounding metropolitan area. LAX is located in the W ...
and
LHR
* Academic testing:
ACT,
SAT
The SAT ( ) is a standardized test widely used for college admissions in the United States. Since its debut in 1926, its name and scoring have changed several times; originally called the Scholastic Aptitude Test, it was later called the Schol ...
* Musical groups:
R.E.M.
R.E.M. was an American rock band from Athens, Georgia, formed in 1980 by drummer Bill Berry, guitarist Peter Buck, bassist Mike Mills, and lead vocalist Michael Stipe, who were students at the University of Georgia. One of the first alternati ...
,
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 in ...
,
TLC
TLC may refer to:
Arts and entertainment Television
* ''TLC'' (TV series), a 2002 British situational comedy television series that aired on BBC2
* TLC (TV network), formerly the Learning Channel, an American cable TV network
** TLC (Asia), an A ...
,
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 a ...
,
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
The National Rugby League (NRL) is an Australasian rugby league club competition which contains clubs from New South Wales, Queensland, Victoria, the Australian Capital Territory and New Zealand. The NRL formed in 1998 as a joint partnership ...
(Australia);
NPB
or NPB is the highest level of baseball in Japan. Locally, it is often called , meaning ''Professional Baseball''.
Outside Japan, it is often just referred to as "Japanese baseball". The roots of the league can be traced back to the formation ...
(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 prefix
A ship prefix is a combination of letters, usually abbreviations, used in front of the name of a civilian or naval ship that has historically served numerous purposes, such as identifying the vessel's mode of propulsion, purpose, or ownership/n ...
es:
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
Vic (; es, Vic or Pancracio Celdrán (2004). Diccionario de topónimos españoles y sus gentilicios (5ª edición). Madrid: Espasa Calpe. p. 843. ISBN 978-84-670-3054-9. «Vic o Vich (viquense, vigitano, vigatán, ausense, ausetano, ausonense): ...
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 Modi ...
,
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, Washing ...
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,
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
syllable
A syllable is a unit of organization for a sequence of speech sounds typically made up of a syllable nucleus (most often a vowel) with optional initial and final margins (typically, consonants). Syllables are often considered the phonological "bu ...
s—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
Hair is a protein filament that grows from follicles found in the dermis. Hair is one of the defining characteristics of mammals.
The human body, apart from areas of glabrous skin, is covered in follicles which produce thick terminal and f ...
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 agency, intelligence and Security agency, security service of the United States and its principal Federal law enforcement in the United States, federal law enforcement age ...
CIA
The Central Intelligence Agency (CIA ), known informally as the Agency and historically as the Company, is a civilian intelligence agency, foreign intelligence service of the federal government of the United States, officially tasked with gat ...
. 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 BBC radio comedy, ''The Hitchhiker's Guide to the Galaxy'' developed into a " ...
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
The Jargon File is a glossary and usage dictionary of slang used by computer programmers. The original Jargon File was a collection of terms from technical cultures such as the MIT AI Lab, the Stanford AI Lab (SAIL) and others of the old ARPANET A ...
, 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
The Jargon File is a glossary and usage dictionary of slang used by computer programmers. The original Jargon File was a collection of terms from technical cultures such as the MIT AI Lab, the Stanford AI Lab (SAIL) and others of the old ARPANET A ...
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](_blank)
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 Hof ...
.
See also
*
ISO 4217
ISO 4217 is a standard published by the International Organization for Standardization (ISO) that defines alpha codes and numeric codes for the representation of currencies and provides information about the relationships between individual cu ...
(currency code)
*
List of acronyms
Lists of acronyms contain acronyms, a type of abbreviation formed from the initial components of the words of a longer name or phrase. They are organized alphabetically and by field.
Alphabetical
* List of acronyms: 0–9
* List of acronyms: A ...
*
List of airports by IATA code
The following are lists of airports by IATA code and ICAO code:
By IATA code
By ICAO code
{{DEFAULTSORT:IATA code
Airports by IATA code ...
*
List of computing and IT abbreviations
*
*
List of three-letter broadcast call signs in the United States
This is a list of radio and television broadcasting stations in the United States that are currently assigned three-letter call signs.
Overview
In the United States, all radio and television broadcasting stations that are licensed by the Federa ...
*
Photographers' abbreviations
During most of the 20th century photography depended mainly upon the photochemical technology of silver halide emulsions on glass plates or roll film.Langford, Michael. ''Story of Photography''. Focal Press, 1998, pp. 224. . Early in the 21 ...
*
Q code
The Q-code is a standardised collection of three-letter codes that each start with the letter "Q". It is an operating signal initially developed for commercial radiotelegraph communication and later adopted by other radio services, especially ...
*
RAS syndrome
RAS syndrome (where "RAS" stands for "redundant acronym syndrome", making the phrase "RAS syndrome" Autological word, homological) is the redundant use of one or more of the words that make up an acronym (or other initialism) in conjunction with ...
*
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 ...
*
Alphabet Agencies
References
{{DEFAULTSORT:Three-letter Acronym
Abbreviations
T