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AA may refer to: AA Organizations and businesses - The Albany Academy, an independent day school for boys in Albany, New York
- Albuquerque Academy, an independent day school in Albuquerque, New Mexico
- Alcoa, an American aluminium-producing company with the stock ticker symbol AA
- Alcoholics Anonymous, a worldwide fellowship of persons recovering from alcoholism
- Aligned Assets, a UK software house specialising in gazetteer management systems
- Alvesta Alternative, a political party in Sweden
- Amalgamated Association of Iron and Steel Workers, a former union in the United States
- American Apparel, a clothing company in the United States
- American Atheists, an organization advocating for atheists in the United States
- Amir Adnan, a Pakistani fashion label for men
- Andecha Astur, an Asturian nationalist party
- Annuaires Afrique, an African online directory
- Apollo Alliance, an organization advocating energy independence and renewable energy for the United States
- Architects' Association of Denmark (Akademisk Arkitektforening)
- Architectural Association School of Architecture, London
- The Automobile Association, a British motoring organisation
- Foreign Office (Germany) (Ausw rtiges Amt), the Foreign Office of Germany
Transportation - AA, a former name of the K line, a defunct line on the New York City Subway
- Adelaide Airport, Australia
- Aerol neas Argentinas, an Argentine airline
- Air America (airline), a CIA front that supplied covert operations during the Vietnam War
- AirAsia, a Malaysian airline
- American Airlines, IATA airline code
- Ann Arbor Railroad (disambiguation), a railroad connecting Ann Arbor, Michigan and Toledo, Ohio in the United States
- Austrian Airlines, the flag carrying airline of Austria
- NZR AA class, a locomotive class operated by the New Zealand Railways Department
See also Sports, games and pastimes Science, medicine, mathematics and computing - A (lava flow), a type of basaltic lava flow
- AA, or Advanced Architecture, original name of Amiga Advanced Graphics Architecture
- AA amyloidosis, a form of amyloidosis related to Serum amyloid A
- AA postulate of Euclidian geometry
- Academia de Artes, Mexico
- Aggregatibacter actinomycetemcomitans, a species of bacteria found to be in association with certain types of periodontal disease
- Amino acid
- Amplitude of accommodation, a measurement of the eye's ability to focus clearly on objects at near distances
- Antarctic Impulse Transient Antenna, also known as AA-experiment
- Anti-aliasing, a computer graphics technique
- Aortic aneurysm
- 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 spectroscopy, an instrument for measuring the content of metal in samples
Other - AA battery size
- AA Brassiere measurement
- AA certificate - a film rating used by the British Board of Film Classification Censors between 1970 and 1982, restricting audiences to those aged 14 and over
- Abhisamayalankara, or Abhisamaya-ala k ra, a Mahayana Buddhist text.
- Affirmative action, a social policy dealing with underrepresented minorities
- African American
- Agreement on Agriculture, a WTO treaty
- Air attach , usually a high-ranking air force officer on the staff of an embassy
- Alisha's Attic, British pop/rock group
- Amon Amarth
- Antarctica, World Meteorological Organization country code
- Anti-aircraft warfare, a military term for combat against airborne enemies from the ground
- Anti-aliasing filter a filter used in digital signal processing
- 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 degree
- Assumptionists, the Augustinians of the Assumption, a congregation of Catholic religious (priests and brothers)
- Audio Adrenaline
- Audio-Animatronics
- Ayt Ayache
- The production code for The Savages (Doctor Who), a Doctor Who serial
A A - A A , (Latin: Argenteum Astrum), a magical order created by Aleister Crowley
Aa - , letter found in several languages including Swedish, Norwegian and Danish, which can be alternatively transcribed as "aa" (not in Swedish).
- Aa River (disambiguation), the name of several waterways in Europe
- Aa! Megami-sama or Oh My Goddess!, a popular anime/manga series
- Aa (Big A Little a), an American noise rock group
- Aa!, a J-Pop musical group
- Aa (architect), an architect in ancient Egypt
- Aa (lava flow), a type of lava (see below)
- Aa (plant), a genus of orchid
- Aa, Estonia, a village on northern coast of Estonia
- AUTOart, a high quality die cast model car manufacturer
People with the surname Aa People with first initials A. A. - A. A. Ames (1842 1911), American soldier and politician, multi-term mayor of Minneapolis, Minnesota
- A. A. AbouTaleb, Egyptian squash player
- A. A. Belopolsky (1854 1934), Russian astronomer; Aristarkh Belopolsky
- A. A. Caruana (1830 1905), Maltese archaeologist and author; see Antonio Annetto Caruana
- A. A. Common (1841 1903), English amateur astronomer; see Andrew Ainslie Common
- A. A. Birch, Jr. (born 1932), American jurist first African American Chief Justice of the Tennessee Supreme Court
- A. A. Englander (1915 2004), British television cinematographer
- A. A. Griffith (1893 1963), English engineer; see Alan Arnold Griffith
- A. A. Luce (1882 1977), Irish philosopher
- A. A. Milne (1882 1956), English author and playwright, creator of Winnie-the-Pooh
'A' aA - abampere, the CGS unit of current
- attoampere, 10 18 ampere, a unit of electric current
aa .aa Aa. - Aa., medical abbreviation for arteria, or artery
Double A See also bs:AA ca:Aa cs:AA da:AA de:AA et:AA el:AA es:AA eo:Aa fa:AA fr:AA ko:AA id:AA is:Aa it:AA sw:AA lv:AA lt:AA nl:Aa ja:AA no:AA pl:AA pt:AA ro:AA ru:AA sk:AA sl:AA sr:AA fi:Aa sv:AA tl:AA th:AA tr:AA zh:AA
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