# AA

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

## Arts, entertainment and media

- *[America's Army](/source/America's_Army)*, a 2002 computer game published by the U.S. Army
- *[Ancient Anguish](/source/Ancient_Anguish)*, a computer game in existence since 1992
- [Aa!](/source/Aa!), a J-Pop musical group
- [AA (band)](/source/AA_(band)), South Korean boy band
- [*Aa* (album)](/source/Aa_(album)), a 2016 album by Baauer
- [AA (song)](/source/AA_(song)), a 2021 single by Walker Hayes
- *[Ace Attorney](/source/Ace_Attorney)*, a series of video games developed by Capcom.
- [AA Films](/source/AA_Films), an Indian film distribution company
- [All American (TV series)](/source/All_American_(TV_series)), a 2018 American sports drama television series
- [AA Book (disambiguation)](/source/AA_Book_(disambiguation))
- AA, the production code for the 1966 *Doctor Who* serial *[The Savages](/source/The_Savages_(Doctor_Who))*
- [Academy Award](/source/Academy_Award), in the film industry

## Brands, organizations and enterprises

- [Alcoholics Anonymous](/source/Alcoholics_Anonymous), support organization
- [A. A. Arms](/source/A._A._Arms), a defunct firearms manufacturer
- [Aerolíneas Argentinas](/source/Aerol%C3%ADneas_Argentinas), an Argentine airline
- [AirAsia](/source/AirAsia), an airline
- [Air Austral](/source/Air_Austral) airline, former logo
- [Alcoa](/source/Alcoa), a US aluminum producer, stock symbol
- [American Airlines](/source/American_Airlines), IATA code
- [Anadolu Agency](/source/Anadolu_Agency), press agency, Turkey
- [Arakan Army](/source/Arakan_Army), Rakhine State, Myanmar, a rebel group
- [Audio-Animatronics](/source/Audio-Animatronics), used at Disney Parks
- [Ascend Airways](/source/Ascend_Airways)
- [Academia de Artes](/source/Academia_de_Artes), Mexico
- Former US [Amalgamated Association of Iron and Steel Workers](/source/Amalgamated_Association_of_Iron_and_Steel_Workers)
- [Architectural Association School of Architecture](/source/Architectural_Association_School_of_Architecture), London, United Kingdom
- [Astrological Association of Great Britain](/source/Astrological_Association_of_Great_Britain), London, UK
- [Auswärtiges Amt](/source/Ausw%C3%A4rtiges_Amt), the Foreign Office of Germany
- [Danish Association of Architects](/source/Danish_Association_of_Architects) (*Akademisk Arkitektforening*)
- [The AA](/source/The_AA), UK motoring organization
- [AA Ireland](/source/AA_Ireland), an Irish automotive services company
- AA Motoring Trust, merged into [IAM Motoring Trust](/source/IAM_Motoring_Trust)

## Education

- [Albuquerque Academy](/source/Albuquerque_Academy), independent school in Albuquerque, New Mexico
- [Appreciative advising](/source/Appreciative_advising), a method to enhance interactions between students and advisors
- [Associate of Arts](/source/Associate_of_Arts), an academic degree

## Philosophy and religion

- [Aa Church](/source/Aa_Church), a church in Aakirkeby on the island of Bornholm
- [A∴A∴](/source/A%E2%88%B4A%E2%88%B4), a spiritual organization created in 1907 by Aleister Crowley
- [Abhisamayalankara](/source/Abhisamayalankara), or Abhisamaya-alaṅkāra, a Mahayana Buddhist text
- [Augustinians of the Assumption](/source/Augustinians_of_the_Assumption), a congregation of Catholic religious (priests and brothers)
- [Statue of A'a from Rurutu](/source/Statue_of_A'a_from_Rurutu), a wooden fertility-god sculpture from the Pacific island of Rurutu
- "[A is A](/source/A_is_A)", an expression of the law of identity: each thing is identical with itself
- [Iah](/source/Iah), an ancient moon deity
- AA or A.A. ([After Adam](/source/After_Adam)), year notation in the Mandean calendar

## Language

- aa, [Latin-script digraph](/source/List_of_Latin-script_digraphs#A) used in the orthographies of Dutch, Finnish, and other languages
- aa, representation of letter [Å](/source/%C3%85) in several Scandinavian languages
- aa, a [romanization of Arabic](/source/Romanization_of_Arabic) letter alif
- , an [orthographic ligature](/source/Orthographic_ligature)
- [Afar language](/source/Afar_language) (ISO 639-1 language code aa)
- [Aa (Bengali)](/source/Aa_(Bengali)), a Bengali letter

## Measurements

- AA, a [bra size](/source/Bra_size)
- AA, a width in [shoe sizes](/source/Shoe_size)
- [AA battery](/source/AA_battery) size

## Nature

- [*Aa* (plant)](/source/Aa_(plant)), a genus of orchid
- [*Aa* (gastropod)](/source/Aa_(gastropod)), a subgenus of snail
- [Aā](/source/A%C4%81) or aa, a form of lava
- A term for "river" in German hydronymy, see [Aach (toponymy)](/source/Aach_(toponymy))

## People

- [Aa (surname)](/source/Aa_(surname)), a Scandinavian surname, including a list of people with this name
- [Van der Aa (surname)](/source/Van_der_Aa_(surname)), a Dutch surname, including a list of people with this name
- [Aa (architect)](/source/Aa_(architect)), an architect in Ancient Egypt
- [Anthony Armstrong (writer)](/source/Anthony_Armstrong_(writer)) (1897–1972), Anglo-Canadian writer who used the pseudonym A.A. when writing for *Punch*
- [Allu Arjun](/source/Allu_Arjun) (born 1982), Indian actor, often abbreviated as AA in film titles

## Places

- [Aa, Estonia](/source/Aa,_Estonia), a village and beach in Estonia
- [Aa, Indonesia](/source/Aa,_Indonesia), a populated place in the South Sulawesi province of Indonesia
- [Albania](/source/Albania), LOC MARC code
- [Ann Arbor](/source/Ann_Arbor,_Michigan), a city in Michigan, United States of America
- [Anne Arundel County](/source/Anne_Arundel_County,_Maryland), a county in Maryland, United States of America
- [Antarctica](/source/Antarctica), WMO country code
- [Aruba](/source/Aruba), FIPS country code

## Rivers

### Belgium

- [Aa (Nete)](/source/Aa_(Nete)), in the province of Antwerp, tributary of the [Nete](/source/Nete_(river))

### France

- [Aa (France)](/source/Aa_(France))

### Germany

- [Aabach (Afte)](/source/Aabach_(Afte)), formerly Große Aa, North Rhine-Westphalia
- [Aa (Möhne)](/source/Aa_(M%C3%B6hne)), North Rhine-Westphalia
- [Aa (Nethe)](/source/Aa_(Nethe)), North Rhine-Westphalia
- [Aa (Werre)](/source/Aa_(Werre)), North Rhine-Westphalia
- [Bocholter Aa](/source/Bocholter_Aa), North Rhine-Westphalia
- [Dreierwalder Aa](/source/Dreierwalder_Aa), North Rhine-Westphalia
- [Kleine Aa (Aabach)](/source/Kleine_Aa_(Aabach)), a tributary of the Aabach in North Rhine-Westphalia
- [Große Aa](/source/Gro%C3%9Fe_Aa), a tributary of the Ems in Lower Saxony
- [Große Aa (Aabach)](/source/Gro%C3%9Fe_Aa_(Aabach)), a tributary of the Aabach in North Rhine-Westphalia
- [Münstersche Aa](/source/M%C3%BCnstersche_Aa), North Rhine-Westphalia
- [Schaler Aa](/source/Schaler_Aa), Lower Saxony and North Rhine-Westphalia
- [Speller Aa](/source/Speller_Aa), Lower Saxony and North Rhine-Westphalia
- [Steinfurter Aa](/source/Steinfurter_Aa), North Rhine-Westphalia

### Netherlands

- [Aa (Meuse)](/source/Aa_(Meuse)), North Brabant
- [Aa of Weerijs](/source/Aa_of_Weerijs), North Brabant
- [Drentsche Aa](/source/Drentsche_Aa), Drenthe and Groningen
- [Ruiten Aa](/source/Ruiten_Aa), a river in [Westerwolde](/source/Westerwolde_(region)), Groningen

### Switzerland

- [Aabach (Aare)](/source/Aabach_(Aare)), a tributary of the Aare, in Aargau canton
- [Aabach (Greifensee)](/source/Aabach_(Greifensee)) or Ustermer Aa, in canton of Zürich
- [Aabach (Obersee)](/source/Aabach_(Obersee)), a tributary of Obersee (Zürichsee), in canton of St. Gallen
- [Aabach (Seetal)](/source/Aabach_(Seetal)), in the cantons of Lucerne and Aargau
- [Chli Aa (Sempachersee)](/source/Chli_Aa_(Sempachersee)), a tributary of Lake Sempach in the canton of Lucerne
- [Engelberger Aa](/source/Engelberger_Aa), in the cantons of Obwalden and Nidwalden
- [Gross Aa (Sempachersee)](/source/Gross_Aa_(Sempachersee)), a tributary of Lake Sempach in the canton of Lucerne
- [Mönchaltorfer Aa](/source/M%C3%B6nchaltorfer_Aa), a tributary of Greifensee in canton of Zürich
- [Sarner Aa (river)](/source/Sarner_Aa_(river)), Obwalden, tributary of Lake Lucerne

### Latvia

- [Gauja](/source/Gauja), Latvia, formerly known as *Livländische Aa*
- [Lielupe](/source/Lielupe), Latvia, formerly known as *Kurländische Aa*

## Science and technology

- AA, [Audible.com](/source/Audible.com) file format
- [AA amyloidosis](/source/AA_amyloidosis)
- [AA postulate](/source/AA_postulate) of Euclidean geometry
- [AA tree](/source/AA_tree) in computer science
- [Abstract algebra](/source/Abstract_algebra), a branch of mathematics
- [Adobe Animate](/source/Adobe_Animate), an animation software
- Advanced Architecture, later [Amiga Advanced Graphics Architecture](/source/Amiga_Advanced_Graphics_Architecture)
- [Alopecia areata](/source/Alopecia_areata), a condition in which hair is lost from areas of the body
- Anesthesiologist assistant, see [certified anesthesiologist assistant](/source/Certified_anesthesiologist_assistant)
- [Anti-aircraft](/source/Anti-aircraft), in military use
- [Aplastic anemia](/source/Aplastic_anemia), a disease
- [Arachidonic acid](/source/Arachidonic_acid), a polyunsaturated fatty acid
- [Atlas Autocode](/source/Atlas_Autocode), a computer programming language
- Attoampere (aA), 10−18 [Ampere](/source/Ampere), a unit of electric current
- [Authoritative Answer](/source/Authoritative_Answer) bit, in DNS, a flag for a query answer
- Internet slang for [ASCII Art](/source/ASCII_Art)
- Japanese internet slang for [Shift JIS art](/source/Shift_JIS_art)
- [azidoazide azide](/source/1-diazidocarbamoyl-5-azidotetrazole)

## Sports

- [Double-A (baseball)](/source/Double-A_(baseball)) or Class AA, a Minor League Baseball classification level
- [American Association (1882–1891)](/source/American_Association_(1882%E2%80%931891)), US baseball league
- [American Association (1902–1997)](/source/American_Association_(1902%E2%80%931997)), US baseball league
- [American Association of Professional Baseball](/source/American_Association_of_Professional_Baseball), North American baseball league
- [Athletics Australia](/source/Athletics_Australia)
- [All-America](/source/All-America), American amateur athletic award
- [Amateur Athletic Union](/source/Amateur_Athletic_Union), US, since 1884

## Transportation

- [AA Highway](/source/AA_Highway), Kentucky, US
- Former [Ann Arbor Railroad (1895–1976)](/source/Ann_Arbor_Railroad_(1895%E2%80%931976)), Ohio and Michigan
- [Ann Arbor Railroad (1988)](/source/Ann_Arbor_Railroad_(1988)), Ohio and Michigan
- Former [*K* line](/source/K_(Eighth_Avenue_Local)), New York City Subway, formerly "AA"
- [NZR AA class](/source/NZR_AA_class), a New Zealand locomotive class
- Magelang, Purworejo, Kebumen, Temanggung and Wonosobo ([vehicle registration](/source/Vehicle_registration_plates_of_Indonesia) prefix AA)

## Other uses

- [Anna's Archive](/source/Anna's_Archive), search engine for shadow libraries
- [Asian Aerospace](/source/Asian_Aerospace), an air show in Asia
- [European Union Association Agreement](/source/European_Union_Association_Agreement)
- [Postal abbreviation](/source/List_of_U.S._state_abbreviations) for the United States armed forces in the Americas

## See also

- [AAA (disambiguation)](/source/AAA_(disambiguation))
- [Grosse Aa (disambiguation)](/source/Grosse_Aa_(disambiguation))
- [Kleine Aa (disambiguation)](/source/Kleine_Aa_(disambiguation))
- *[A Aa](/source/A_Aa)*, a film
- [Automobile Association (disambiguation)](/source/Automobile_Association_(disambiguation))

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Adapted from the Wikipedia article [AA](https://en.wikipedia.org/wiki/AA) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/AA?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.