AR, Ar, or A&R may refer to:

Arts, entertainment, and media

Music

Periodicals

* ''

Absolute Return + Alpha ''AR: Absolute Return + Alpha'' (or ''AR'') is a hedge fund magazine founded in 2009. The magazine has its editorial offices in New York City. History and profile ''Absolute Return + Alpha'' (''AR'') was launched in September 2009, as a subsidia ...

'', a hedge fund publication *'' The Adelaide Review'', an Australian arts magazine * ''American Renaissance'' (magazine), a white nationalist magazine and website * ''

Architectural Review ''The Architectural Review'' is a monthly international architectural magazine. It has been published in London since 1896. Its articles cover the built environment – which includes landscape, building design, interior design and urbanism � ...

'', a British architectural journal * ''

Armeerundschau From 1956 to 1990, ''Armeerundschau'' or “AR” (English: ''Army Panorama'') was a monthly soldier’s magazine for members of the East German National People’s Army (German: Nationale Volksarmee or NVA). The magazine was published by the NVA ...

'', a magazine of the East German army

Other media

* Ar, city on the fictional planet

Gor Gor () is the fictional setting for a series of sword and planet novels written by philosophy professor John Lange, writing as John Norman. The setting was first described in the 1966 novel ''Tarnsman of Gor''. The series is inspired by science f ...

* ''a.r.'' group of Polish artists and poets, including

Katarzyna Kobro Katarzyna Kobro (26 January 1898 – 21 February 1951) was a Polish avant-garde sculptor and a prominent representative of the Constructivist movement in Poland. A pioneer of innovative multi-dimensional abstract sculpture, she rejected Aes ...

* Alternate reality (disambiguation), various fictional concepts

Business

* Accounts receivable, abbreviated as AR or A/R * Acoustic Research, an American audio electronics manufacturer * Aerojet Rocketdyne, an American aerospace and defense manufacturer * Aerolíneas Argentinas (IATA airline code AR) * Some Alfa Romeo car models, e.g. AR51 * Toyota AR engine

Language

* ''Ar'', the Latin letter R when spelled out *

Ar (cuneiform) The cuneiform Ar sign, .—is a cuneiform sign that is a combined sign, containing Ši (cuneiform), and Ri (cuneiform). It is used in one prominent name in the '' Amarna letters'', for Šuwardata, as well as in a number of Amarna letters. ...

, a cuneiform combined sign * Arabic, by ISO 639-1 language code

Mathematics, science, and technology

Computing

* ar (Unix), a Unix archive format and handling tool * Accelerated Reader, educational reading assessment software *

Augmented reality Augmented reality (AR) is an interactive experience that combines the real world and computer-generated content. The content can span multiple sensory modalities, including visual, auditory, haptic, somatosensory and olfactory. AR can be de ...

, an application of virtual reality in the real world

Biology and medicine

Androgen receptor The androgen receptor (AR), also known as NR3C4 (nuclear receptor subfamily 3, group C, member 4), is a type of nuclear receptor that is activated by binding any of the androgenic hormones, including testosterone and dihydrotestosterone in th ...

, a nuclear hormone receptor * Aortic regurgitation, a heart valve disease * Autosomal recessive inheritance

Mathematics

* ar-, a prefix of inverse hyperbolic functions * Autoregressive model, concerning random processes in statistics

Physics and chemistry

* Aqua regia, a chemical mixture * Archimedes number in fluid dynamics * Argon, symbol Ar, a chemical element * Aryl group in organic chemistry * Relative atomic mass, symbolized as ''A''_r

Other uses in science and technology

* Anti-reflective, coating of lenses * Aspect ratio (aeronautics), of a wing

Military and weapons

* US Navy hull classification symbol for repair ships *

Armalite Rifle ArmaLite, or Armalite, is an American small arms engineering company, formed in the early 1950s, in Hollywood, California. Many of its products, as conceived by chief designer Eugene Stoner, relied on unique foam-filled fiberglass butt/stock fur ...

** AR-15 style rifle, rifles based on ArmaLite's AR-15 *

Army Reserve (Ireland) , image= Badge of the Irish Defence Forces.svg , image_size = 150 , caption= Cap badge of the Defence Forces , dates= 1 October 2005–present , country= , allegiance= , branch= Army , type= Military reserve force , role= , size= 1,840 active ...

, the land component of the Irish Reserve Defence Forces (RDF)

Places

* Ar (city), in ancient Moab *

Appenzell Ausserrhoden Appenzell Ausserrhoden (; in English sometimes Appenzell Outer Rhodes) (german: Kanton Appenzell Ausserrhoden; rm, Chantun Appenzell Dadora; french: Canton d'Appenzell Rhodes-Extérieures; it, Canton Appenzello Esterno) is one of the 26 canton ...

, Switzerland *

Province of Arezzo The province of Arezzo ( it, provincia di Arezzo) is the easternmost province in the Tuscany region of central Italy. Its capital is the city of Arezzo. The province is bordered by the regions of Marche, Emilia-Romagna, Umbria, and the provinces ...

, Italy, vehicle registration code * Argentina (ISO 3166-1 alpha-2 country code) **

.ar .ar is the Internet country code top-level domain ( ccTLD) for Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America South America ...

, the country code Top Level Domain for Argentina * Arkansas, United States *

Armstrong–Ringsted Community School District Armstrong–Ringsted Community School District (A-R) was a school district headquartered in Armstrong, Iowa. Its area included sections of Emmet, Kossuth and Palo Alto counties, and it served the communities of Armstrong and Ringsted. It opera ...

, Iowa, United States

Politics and ethics

* Affirmative Repositioning, a political movement in Namibia * Animal rights, a philosophy *

Animal rights movement The animal rights (AR) movement, sometimes called the animal liberation, animal personhood, or animal advocacy movement, is a social movement that seeks an end to the rigid moral and legal distinction drawn between human and non-human animals, ...

, a social movement advocating for other animals *

Antipodean Resistance Antipodean Resistance (AR) is an Australian neo-Nazi hate group. The group, formed in October 2016, uses the slogan "We're the Hitlers you've been waiting for" and makes use of Nazi symbols such as the swastika and the Nazi salute. AR's logo ...

, an Australian neo-Nazi group

Other uses

* 🜇 or AR, a numismatic abbreviation for "silver" * Argent, the heraldic tincture of silver *

Assistant referee (association football) In association football, an assistant referee (previously known as a linesman or lineswoman) is an official empowered with assisting the referee (association football), referee in enforcing the Laws of the Game (association football), Laws of th ...

* Auto rickshaw, a motorized three-wheeled vehicle common in South Asia *

Avis de réception Avis is Latin for bird and may refer to: Aviation *Auster Avis, a 1940s four-seat light aircraft developed from the Auster Autocrat (abandoned project) *Avro Avis, a two-seat biplane *Scottish Aeroplane Syndicate Avis, an early aircraft built by ...

, postal advice or acknowledgement of receipt {{Disambiguation