AA, A∴A∴, Aa, 'A'a, aa and aA may refer to:
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AA
Transportation
- Aerolíneas Argentinas, an Argentine airline
- American Airlines, IATA airline code
- Air America was a CIA front that supplied covert operations during the Vietnam War
- Ann Arbor Railroad, a railroad connecting Ann Arbor, Michigan and Toledo, Ohio in the United States
- NZR Aa class, a locomotive class operated by the New Zealand Railways Department
- AA Motoring Trust, a British road safety charity
- An Automobile Association
- The Automobile Association, a British motoring organisation
- The Automobile Association (Ireland), an Irish motoring organisation
- within a country to refer to the Automobile Association of that country, such as the New Zealand Automobile Association
- AA Publishing, a trading name of The Automobile Association in the UK
Organizations and businesses
- Albuquerque Academy, an independent day school in Albuquerque, New Mexico
- Alcoa, an American aluminum-producing company with the stock ticker symbol AA
- Alcoholics Anonymous, a worldwide fellowship of persons recovering from alcoholism
- Alvesta Alternative, a political party in Sweden roxx
- Amalgamated Association of Iron and Steel Workers, a former union in the United States
- American Atheists, an organization advocating for atheists in the United States
- American Apparel, a clothing company in the United States
- The Albany Academy, an independent day school for boys in Albany, New York
- Amir Adnan, a Pakistani fashion label for men
- Annuaires Afrique, an African online directory
- Architectural Association School of Architecture, the prestigious London based School of Architecture
- Asbestos Association, the British asbestos manufacturers' association
- Foreign Office (Germany) (Auswärtiges Amt), the Foreign Office of Germany
- Armenian Aryans Armenian Aryan group
- Assassins Association, a small gang in the United States
Sports, games and pastimes
- Ace-Ace, in a poker hand
- America's Army, a computer game published by the U.S. Army
- American Association (19th century), baseball
- American Association (20th century), baseball
- American Association of Independent Professional Baseball started in 2006
- Ancient Anguish, an LPMud (computer game) in existence since 1992
- Class AA, a level in the Farm System of minor league baseball
- Pocket Aces, the best possible starting hand in Texas Hold Em
- Arn Anderson, professional wrestler
- Alternate Achievement: a concept in the game, EverQuest II, which came out in the expansion pack EverQuest II: Kingdom of Sky.
- Zoo Tycoon 2: African Adventure
- A very high grade in Dance Dance Revolution
- Ace Attorney, a series of courtroom based video games called Gyakuten Saiban (meaning Turnabout Trial) in Japan.
Science, mathematics and computing
- AA chipset, the computer graphics architecture found in the Amiga 4000
- AA postulate of Euclidian geometry
- Academia de Artes, Mexico
- Amino acid
- Amplitude of accommodation, a measurement of the eye's ability to focus clearly on objects at near distances
- Anti-aliasing, a computer graphics technique
- Arachidonic acid, a polyunsaturated fatty acid
- ASCII art, an artistic medium in which pictures are composed of symbols taken from the ASCII computer character set
- Atlas Autocode, a computer programming language
- Atomic Absorption Spectrophotometer, an instrument for measuring the content of metal in samples
- Actinobacillus actinomycetemcomitans, a species of bacteria found to be in association with certain types of periodontal disease.
Other
- AA battery size
- AA brassiere cup size
- Aa, Big A little a, a musical group that blends old-world percussion with electronic noise
- Affirmative action, a social policy dealing with underrepresented minorities
- African American
- Air Attache, usually a high-ranking air force officer on the staff of an embassy
- Antarctica, WMO country code
- Anti-aircraft warfare, a military term for combat against airborne enemies from the ground
- Armed Forces Americas, United States postal abbreviation
- Aruba (DAFIF 0413 / DIA 65-18 / FIPS PUB 10-4 territory code)
- Asian Aerospace, the biggest airshow event in Asia
- Asian American
- Associate of Arts, a kind of associate's degree
- Audio Adrenaline
- The production code for The Savages, a Doctor Who serial.
A∴A∴
- Argenteum Astrum, a magical order created by Aleister Crowley
Aa
- Å, letter found in several languages including Swedish, Norwegian and Danish, which can be alternatively transcribed as "aa"
- Aa!, a J-Pop musical group
- Aa, a type of lava
- Aa (plant), a genus of orchid
- Aa, Estonia, a village on northern coast of Estonia
- Aa River (or Å River), the name of several waterways in Europe
- Brynjar Aa, Norwegian dramatist
- Van der Aa, a Dutch name
- Johann van der Aa, father of Petrus van der Aa
- Petrus van der Aa (1530—1594), a Flemish jurist
- Philips van der Aa, a Dutch stateman during the Eighty Years' War
- Pieter van der Aa (1659—1733), a Dutch publisher
- Terje Aa, bridge player
- Aa! Megami-sama or Oh My Goddess! is a popular anime/manga series
- AUTOart, a high quality die cast model car manufacturer
- Aa, Experimental post-punk/no-wave group from Brooklyn, NY (also known as Big A Little a)
'A'a
aA
- attoampere, an SI unit of electric current (equal to 10−18 A)
- abampere, the CGS unit of current
aa
- Aquanaut Academy International, diver training organization
- Afar language, ISO 639 alpha-2 language code
- Authoritative Answer, in DNS a flag for query answer
- Aa, a digraph
.aa
- a proprietary digital audio format of Audible.com


