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), 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

- 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.

## 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

### 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<sup>−18</sup> 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<sup>A</sup> 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)