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 AA (band), South Korean boy band Aa (album), 2016, 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 All American (TV series), a 2018 American sports drama series AA Book (disambiguation) "The Savages" (Doctor Who), a 1966 Doctor Who serial (production code "AA") Academy Award, in the film industry
Brands, organizations and enterprises Airlines Aerolíneas Argentinas, an Argentine airline AirAsia Air Austral airline, former logo American Airlines, IATA code Ascend Airways
Other organizations
Alcoholics Anonymous, support organization A. A. Arms, a defunct firearms manufacturer Alcoa, a US aluminum producer, stock symbol Anadolu Agency, press agency, Turkey Arakan Army, Rakhine State, Myanmar, a rebel group Audio-Animatronics, used at Disney Parks Academia de Artes, Mexico Former US Amalgamated Association of Iron and Steel Workers Architectural Association School of Architecture, London, UK Astrological Association of Great Britain, London, UK Auswärtiges Amt, the Foreign Office of Germany Danish Association of Architects (Akademisk Arkitektforening) The AA, UK motoring organization AA Ireland, an Irish automotive services company AA Motoring Trust, merged into IAM Motoring Trust
Education Albuquerque Academy, independent school in Albuquerque, New Mexico Appreciative advising, a method to enhance interactions between students and advisors Associate of Arts, an academic degree
Philosophy and religion Aa Church, a church in Aakirkeby on the island of Bornholm 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 Iah, an ancient moon deity AA or A.A. (After Adam), year notation in the Mandean calendar
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 , an orthographic ligature Afar language (ISO 639-1 language code aa) Africa Alphabet, alphabet used for African languages Aa (Bengali), a Bengali letter
Measurements AA, a bra size AA, a width in shoe sizes AA battery size Attoampere (aA), 10−18 Ampere, a unit of electric current
People Aa (surname), Scandinavian surname, including a list of people with this name Van der Aa (surname), Dutch surname, including a list of people with this name Aa (architect), in Ancient Egypt Anthony Armstrong (writer) (1897–1972), Anglo-Canadian writer who used the pseudonym A.A. when writing for Punch Allu Arjun (born 1982), Indian actor, often abbreviated as AA in film titles
Places
Aa, Estonia, a village and beach in Estonia Aa, Indonesia, a populated place in the South Sulawesi province of Indonesia Albania, LOC MARC code Ann Arbor, Michigan, US Anne Arundel County, Maryland, US Antarctica, WMO country code Aruba, FIPS country code
Rivers Germany Aabach (Afte), formerly Große Aa, North Rhine-Westphalia Aa (Möhne), North Rhine-Westphalia Aa (Nethe), North Rhine-Westphalia Aa (Werre), North Rhine-Westphalia Bocholter Aa, North Rhine-Westphalia Dreierwalder Aa, 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, North Rhine-Westphalia Schaler Aa, Lower Saxony and North Rhine-Westphalia Speller Aa, Lower Saxony and North Rhine-Westphalia Steinfurter Aa, North Rhine-Westphalia
Netherlands Aa (Meuse), North Brabant Aa of Weerijs, North Brabant Drentsche Aa, Drenthe and Groningen , a river in Westerwolde, Groningen
Switzerland Aabach (Aare), a tributary of the Aare, in Aargau canton Aabach (Greifensee) or Ustermer Aa, in canton of Zürich Aabach (Obersee), a tributary of Obersee (Zürichsee), in canton of St. Gallen Aabach (Seetal), in the cantons of Lucerne and Aargau Chli Aa (Sempachersee), a tributary of Lake Sempach in the canton of Lucerne Engelberger Aa, in the cantons of Obwalden and Nidwalden 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), Obwalden, tributary of Lake Lucerne
Elsewhere Aa (Nete), in the province of Antwerp, Belgium; a tributary of the Nete Aa (France) Gauja, Latvia, formerly known as Livländische Aa Lielupe, Latvia, formerly known as Kurländische Aa
Science, technology, and mathematics Biology Aa (plant), a genus of orchid Aa (gastropod), a subgenus of snail
Chemistry Arachidonic acid, a polyunsaturated fatty acid Azidoazide azide
Computing AA, Audible.com file format AA tree in computer science Adobe Animate, an animation software Advanced Architecture, later Amiga Advanced Graphics Architecture Atlas Autocode, a computer programming language Authoritative Answer bit, in DNS, a flag for a query answer ASCII Art, in internet slang Shift JIS art, in Japanese internet slang
Mathematics AA postulate of Euclidean geometry Abstract algebra, a branch of mathematics
Medicine AA amyloidosis Alopecia areata, a condition in which hair is lost from areas of the body Anesthesiologist assistant; see certified anesthesiologist assistant Aplastic anemia, a disease
Other uses in science and technology Anti-aircraft, in military use Attoampere (aA), 10−18 Ampere, a unit of electric current
Sports Baseball Double-A (baseball) or Class AA, a Minor League Baseball classification level American Association (1882–1891), US baseball league American Association (1902–1997), US baseball league American Association of Professional Baseball, North American baseball league
Other sports Athletics Australia All-America, American amateur athletic award All-Australian team, all-star team of Australian rules footballers Amateur Athletic Union, US, since 1884
Transportation
AA Highway, Kentucky, US Former Ann Arbor Railroad (1895–1976), Ohio and Michigan Ann Arbor Railroad (1988), Ohio and Michigan Former K line, New York City Subway, formerly "AA" NZR AA class, a New Zealand locomotive class Magelang, Purworejo, Kebumen, Temanggung and Wonosobo (vehicle registration prefix AA)
Other uses Aā or aa, a form of lava A term for "river" in German hydronymy; see Aach (toponymy) Anna's Archive, a search engine for shadow libraries Asian Aerospace, an air show in Asia European Union Association Agreement US armed forces in the Americas (postal abbreviation AA)
See also AAA (disambiguation) Grosse Aa (disambiguation) Kleine Aa (disambiguation) A Aa, a film Automobile Association (disambiguation)