# AA

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), stylized 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
* Academy Award, in the film industry

## Brands, organizations and enterprises

* Alcoholics Anonymous, support organization
* A. A. Arms, a defunct firearms manufacturer
* Aerolíneas Argentinas, an Argentine airline
* Air Asia, an airline
* Air Austral airline, former logo
* Alcoa, a US aluminum producer, stock symbol
* American Airlines, IATA code
* 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, United Kingdom
* 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
* Associate of Arts, an academic degree

## 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
* 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 ⟨ا⟩
* Ꜳ, 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
* 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. 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, a city in Michigan, United States of America
* Anne Arundel County, a county in Maryland, United States of America
* Antarctica, WMO country code
* Aruba, FIPS country code

## Rivers
### Belgium

* Aa (Nete), in the province of Antwerp, tributary of the Nete

### France

* Aa (France)

### 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
* Ruiten Aa [nl], 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

### Latvia

* Gauja, Latvia, formerly known as Livländische Aa
* Lielupe, Latvia, formerly known as Kurländische Aa

## Science and technology

* AA amyloidosis
* Anesthesiologist assistant, see certified anesthesiologist assistant
* Aplastic anemia, a disease
* Arachidonic acid, a polyunsaturated fatty acid
* Advanced Architecture, later Amiga Advanced Graphics Architecture
* Atlas Autocode, a computer programming language
* AA, Audible.com file format
* Authoritative Answer bit, in DNS, a flag for a query answer
* AA postulate of Euclidean geometry
* Anti-aircraft, in military use
* Attoampere (aA), 10$^{−18}$ Ampere, a unit of electric current
* AA tree in computer science
* Abbreviation for azidoazide azide
* Internet slang for ASCII Art
* Japanese internet slang for Shift JIS art

## Sports

* 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
* Athletics Australia
* 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 A$^A$ class, a New Zealand locomotive class
* Ascend Airways

## Other uses

* Anna's Archive, search engine for shadow libraries
* Asian Aerospace, an air show in Asia
* European Union Association Agreement
* Postal abbreviation for the United States armed forces in the Americas