AA

AA, Aa, Double A, or Double-A may refer to:

The Simple English Wiktionary has a definition for: AA, Aa, aa, a-a, and A.A..

Arts, entertainment and media
  • America's Army, a 2002 computer game published by the U.S. Army
  • Ancient Anguish, a computer game in existence since 1992
  • Aa!, a J-Pop musical group
  • Double-A (band), stylised as AA, South Korean boy band
  • Aa (album), a 2016 album by Baauer
  • AA (song), a 2021 single by Walker Hayes
  • Ace Attorney, a series of video games developed by Capcom.
  • AA Films, an Indian film distribution company
  • AA Book (disambiguation)
  • AA, the production code for the 1966 Doctor Who serial The Savages

Brands, organizations and enterprises
  • Alcoholics Anonymous, an international fellowship dedicated to helping alcoholics peer to peer in sobriety
  • A. A. Arms, a defunct firearms manufacturer
  • Aerolíneas Argentinas, an Argentine airline (logo used to consist of two A's)
  • Air Asia, an Asian multinational low cost carrier
  • Alcoa, an American aluminum-producing company (stock symbol AA)
  • American Airlines, major American full-service airline (IATA airline code, logo used to consist of two A’s)
  • Anadolu Agency, a state-run press agency in Turkey
  • Audio-Animatronics, used at the Disney Parks
  • Academia de Artes, Mexico
  • Amalgamated Association of Iron and Steel Workers, a former union in the United States
  • Andecha Astur, an Asturian nationalist party
  • Architectural Association School of Architecture, London, United Kingdom
  • Astrological Association of Great Britain, London, United Kingdom
  • Auswärtiges Amt, the Foreign Office of Germany
  • Danish Association of Architects (Akademisk Arkitektforening)
  • The AA (formerly The Automobile Association), a British motoring organization
  • AA Ireland, an Irish automotive services company
  • AA Motoring Trust, a former British road safety charity operated by The AA that was merged to form the IAM Motoring Trust

Philosophy and religion
  • A∴A∴, a spiritual organization created in 1907 by Aleister Crowley
  • Abhisamayalankara, or Abhisamaya-alaṅkāra, a Mahayana Buddhist text
  • Augustinians of the Assumption, a congregation of Catholic religious (priests and brothers)
  • Statue of A'a from Rurutu, a wooden fertility-god sculpture from the Pacific island of Rurutu
  • "A is A", an expression of the law of identity: each thing is identical with itself

Language
  • aa, Latin-script digraph used in the orthographies of Dutch, Finnish and other languages
  • aa, representation of letter Å in several Scandinavian languages
  • aa, a romanization of Arabic letter alif ا
  • Ꜳ, an orthographic ligature
  • Afar language (ISO 639-1 language code aa)
  • Aa (Bengali), a Bengali letter

Measurements

Nature
  • Aa (plant), a genus of orchid
  • Aa (snail), a subgenus of snail
  • ʻAʻā or aa, a form of lava
  • A term for "river" in German hydronymy, see Aach (toponymy)

People
  • Aa (surname), a Scandinavian surname, including a list of people with this name
  • Van der Aa (surname), a Dutch surname, including a list of people with this name
  • Aa (architect), an architect in ancient Egypt
  • Anthony Armstrong (writer) (1897–1972), Anglo-Canadian writer who used the pseudonym A.A.

Places
  • Aa, Estonia, a village and beach in Estonia
  • Aa, Indonesia, a populated place in the South Sulawesi province of Indonesia
  • Ann Arbor, a city in Michigan, United States of America

Rivers

Belgium
  • Aa (Nete), a river in the province of Antwerp, which joins the Nete

France
  • Aa (France), a river in northern France

Germany
  • Aabach (Afte), formerly called the Große Aa, a river in North Rhine-Westphalia
  • Aa (Möhne), a river in North Rhine-Westphalia
  • Aa (Nethe), a river in North Rhine-Westphalia
  • Aa (Werre), a river in North Rhine-Westphalia
  • Bocholter Aa, a river in North Rhine-Westphalia
  • Dreierwalder Aa, a river in North Rhine-Westphalia
  • Kleine Aa (Aabach), a tributary of the Aabach in North Rhine-Westphalia
  • Große Aa, a tributary of the Ems in Lower Saxony
  • Große Aa (Aabach), a tributary of the Aabach in North Rhine-Westphalia
  • Münstersche Aa, a river in North Rhine-Westphalia
  • Schaler Aa, a river in Lower Saxony and North Rhine-Westphalia
  • Speller Aa, a river in Lower Saxony and North Rhine-Westphalia
  • Steinfurter Aa, a river in North Rhine-Westphalia

Netherlands
  • Aa (Meuse), a river in North Brabant, which joins the Dommel to form the Dieze
  • Aa of Weerijs, a river in North Brabant, which joins the Mark at Breda
  • Drentsche Aa, a river in Drenthe and Groningen
  • Mussel Aa, a river in Westerwolde, Groningen
  • Ruiten Aa, a river in Westerwolde, Groningen
  • Westerwoldsche Aa, a river near Oudeschans, Groningen

Switzerland
  • Aabach (Aare), a tributary of the Aare in canton of Aargau
  • Aabach (Greifensee), or Ustermer Aa, a river in canton of Zürich
  • Aabach (Obersee), a tributary of Obersee (Zürichsee), in canton of St. Gallen
  • Aabach (Seetal), a river in the cantons of Lucerne and Aargau, runs through Lake Hallwyl
  • Chli Aa (Sempachersee), a tributary of Lake Sempach in the canton of Lucerne
  • Engelberger Aa, a river in the cantons of Obwalden and Nidwalden, tributary of Lake Lucerne
  • Gross Aa (Sempachersee), a tributary of Lake Sempach in the canton of Lucerne
  • Mönchaltorfer Aa, a tributary of Greifensee in canton of Zürich
  • Sarner Aa (river), a river in Obwalden, tributary of Lake Lucerne

Latvia
  • Gauja, a river in Latvia, formerly known as Livländische Aa
  • Lielupe, a river in Latvia, formerly known as Kurländische Aa

Science and technology
  • AA amyloidosis, a form of amyloidosis related to serum amyloid A
  • Amino acid, often abbreviated aa when indicating positions in a peptide sequence (e.g., aa 120–150)
  • Antiandrogen, a drug which blocks the effects of androgens
  • Aplastic anemia, a rare disease
  • Arachidonic acid, a polyunsaturated fatty acid
  • Advanced Architecture, original name of Amiga Advanced Graphics Architecture
  • Anti-aliasing, various techniques for mitigating certain signal processing artifacts
  • Atlas Autocode, a computer programming language
  • AA, a proprietary digital audio format of Audible.com
  • Authoritative Answer, in DNS, a flag for a query answer
  • AA postulate of Euclidean geometry
  • Anti-aircraft, in military use
  • Abampere (aA), the CGS unit of current
  • Attoampere (aA), a unit of electric current equal to 10−18 Ampere
  • AA tree, named after Arne Andersson
  • AA, the abbreviation for azidoazide azide
  • AppArmor

Sports
  • Double-A (baseball) or Class AA, a classification level in Minor League Baseball since 1912
  • American Association (1882–1891), a professional baseball league in the United States from 1882 to 1891
  • American Association (1902–1997), a professional baseball league in the United States from 1902 to 1962 and 1969 to 1997
  • American Association of Professional Baseball, a professional baseball league in the United States and Canada since 2006
  • Athletics Australia, national sporting organisation in Australia

Transportation
  • AA Highway, a state highway in Northern Kentucky
  • Ann Arbor Railroad (1895–1976), a defunct railroad in Ohio and Michigan
  • Ann Arbor Railroad (1988), a railroad operating in Ohio and Michigan
  • K line, a defunct line on the New York City Subway, formerly called "AA"
  • NZR AA class, a locomotive class operated by the New Zealand Railways Department

Other uses
  • African American, as a cultural identity
  • Asian Aerospace, an airshow in Asia
  • Associate of Arts, an academic degree
  • European Union Association Agreement
  • Postal abbreviation for United States armed forces in the Americas
  • Japanese internet slang for Shift JIS art
  • Internet slang for ASCII Art
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