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

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
• Ausw?rtiges 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-ala?kāra, 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 ? in several Scandinavian languages
• aa, a romanization of Arabic letter alif ?
• ?, an orthographic ligature
• Afar language (ISO 639-1 language code aa)
• Aa (Bengali), a Bengali letter

Measurements

• AA, a bra size
• AA, a width in shoe sizes
• AA battery size

Nature

• Aa (plant), a genus of orchid
• Aa (snail), a subgenus of snail
• ?A?ā 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 Gro?e Aa, a river in North Rhine-Westphalia
• Aa (M?hne), 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
• Gro?e Aa, a tributary of the Ems in Lower Saxony
• Gro?e 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
• M?nchaltorfer 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 Livl?ndische Aa
• Lielupe, a river in Latvia, formerly known as Kurl?ndische 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 A^A 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

Related pages

• A (disambiguation)