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

Arts, entertainment, and media

Music

Artists and repertoire Artists and repertoire ( colloquially abbreviated to A&R) is the division of a record label or music publishing company that is responsible for talent scouting and overseeing the artistic development of recording artists (singers, instrumental ...

Periodicals

* '' Absolute Return + Alpha'', a hedge fund publication *''

The Adelaide Review ''The Adelaide Review'' (AR) was a monthly print arts magazine and dynamic website in Adelaide, South Australia. It was first published in 1984, but gained standing after one of its writers, Christopher Pearson, took it over in 1985. In March ...

'', 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'', a magazine of the East German army

Other media

* Ar, city on the fictional planet Gor * ''a.r.'' group of Polish artists and poets, including Katarzyna Kobro *

Alternate reality (disambiguation) Alternate reality is often a synonym for parallel universes in fiction. Alternate reality may also refer to: * ''Alternate Realities'' (Cherryh), a 2000 anthology of science fiction by C. J. Cherryh * ''Alternate Reality'' (series), a role-play ...

, various fictional concepts

Business

Accounts receivable Accounts receivable, abbreviated as AR or A/R, are legally enforceable claims for payment held by a business for goods supplied or services rendered that customers have ordered but not paid for. These are generally in the form of invoices raised ...

, abbreviated as AR or A/R *

Acoustic Research Acoustic Research was a Cambridge, Massachusetts-based company that manufactured high-end audio equipment. The brand is now owned by VOXX. Acoustic Research was known for the AR-3 series of speaker systems, which used the acoustic suspension wo ...

, an American audio electronics manufacturer *

Aerojet Rocketdyne Aerojet Rocketdyne is an American manufacturer of rocket, hypersonic, and electric propulsive systems for space, defense, civil and commercial applications. Headquartered in Sacramento, California, the company is owned by Aerojet Rocketdyne Hold ...

, an American aerospace and defense manufacturer *

Aerolíneas Argentinas Aerolíneas Argentinas, formally Aerolíneas Argentinas S.A., is Argentina's largest airline and the country flag carrier. The airline was created in 1949 from the merger of four companies and started operations in . A consortium led by Iberia ...

(IATA airline code AR) * Some

Alfa Romeo Alfa Romeo Automobiles S.p.A. () is an Italian luxury car manufacturer and a subsidiary of Stellantis. The company was founded on 24 June 1910, in Milan, Italy. "Alfa" is an acronym of its founding name, "Anonima Lombarda Fabbrica Automobili." "A ...

car models, e.g. AR51 *

Toyota AR engine The AR engine family is an Inline-4 piston engine series by Toyota, first introduced in 2008 for the RAV4, and subsequently for the Highlander, Venza, Camry and Scion tC. The AR series uses a die-cast aluminium engine block and aluminium ...

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 Arabic (, ' ; , ' or ) is a Semitic language spoken primarily across the Arab world.Semitic languages: an international handbook / edited by Stefan Weninger; in collaboration with Geoffrey Khan, Michael P. Streck, Janet C. E.Watson; Walter ...

, by ISO 639-1 language code

Mathematics, science, and technology

Computing

ar (Unix) The archiver, also known simply as ar, is a Unix utility that maintains groups of files as a single archive file. Today, ar is generally used only to create and update static library files that the link editor or linker uses and for generating . ...

, a Unix archive format and handling tool *

Accelerated Reader Accelerated Reader (AR) is a website used to assist students with reading skills. Components ATOS ATOS is a readability formula designed by Renaissance Learning. Books with quizzes in Accelerated Reader are assigned an ATOS readability level. ...

, educational reading assessment software * Augmented reality, an application of virtual reality in the real world

Biology and medicine

* Androgen receptor, a nuclear hormone receptor *

Aortic regurgitation Aortic regurgitation (AR), also known as aortic insufficiency (AI), is the leaking of the aortic valve of the heart that causes blood to flow in the reverse direction during ventricular diastole, from the aorta into the left ventricle. As a conseq ...

, a heart valve disease *

Autosomal recessive inheritance In genetics, dominance is the phenomenon of one variant (allele) of a gene on a chromosome masking or overriding the effect of a different variant of the same gene on the other copy of the chromosome. The first variant is termed dominant and ...

Mathematics

* ar-, a prefix of

inverse hyperbolic functions In mathematics, the inverse hyperbolic functions are the inverse functions of the hyperbolic functions. For a given value of a hyperbolic function, the corresponding inverse hyperbolic function provides the corresponding hyperbolic angle. Th ...

Autoregressive model In statistics, econometrics and signal processing, an autoregressive (AR) model is a representation of a type of random process; as such, it is used to describe certain time-varying processes in nature, economics, etc. The autoregressive model spe ...

, concerning random processes in statistics

Physics and chemistry

* Aqua regia, a chemical mixture *

Archimedes number In viscous fluid dynamics, the Archimedes number (Ar), is a dimensionless number used to determine the motion of fluids due to density differences, named after the ancient Greek scientist and mathematician Archimedes. It is the ratio of gravit ...

in fluid dynamics *

Argon Argon is a chemical element with the symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the third-most abundant gas in Earth's atmosphere, at 0.934% (9340 ppmv). It is more than twice as ...

, symbol Ar, a chemical element *

Aryl In organic chemistry, an aryl is any functional group or substituent derived from an aromaticity, aromatic ring, usually an aromatic hydrocarbon, such as phenyl and naphthyl. "Aryl" is used for the sake of abbreviation or generalization, and "Ar ...

group in organic chemistry *

Relative atomic mass Relative atomic mass (symbol: ''A''; sometimes abbreviated RAM or r.a.m.), also known by the deprecated synonym atomic weight, is a dimensionless physical quantity defined as the ratio of the average mass of atoms of a chemical element in a giv ...

, symbolized as ''A''_r

Other uses in science and technology

Anti-reflective An antireflective, antiglare or anti-reflection (AR) coating is a type of optical coating applied to the surface of lenses, other optical elements, and photovoltaic cells to reduce reflection. In typical imaging systems, this improves the effic ...

, coating of lenses *

Aspect ratio (aeronautics) In aeronautics, the aspect ratio of a wing is the ratio of its span to its mean chord. It is equal to the square of the wingspan divided by the wing area. Thus, a long, narrow wing has a high aspect ratio, whereas a short, wide wing has a low a ...

, of a wing

Military and weapons

* US Navy hull classification symbol for

repair ship A repair ship is a naval auxiliary ship designed to provide maintenance support to warships. Repair ships provide similar services to destroyer, submarine and seaplane tenders or depot ships, but may offer a broader range of repair capability incl ...

s *

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 An AR-15-style rifle is any lightweight semi-automatic rifle based on the Colt AR-15 design. The original ArmaLite AR-15 is a scaled-down derivative of Eugene Stoner's ArmaLite AR-10 design. The then Fairchild Engine and Airplane Corporation d ...

, rifles based on ArmaLite's AR-15 * Army Reserve (Ireland), the land component of the Irish Reserve Defence Forces (RDF)

Places

Ar (city) Ar is mentioned in the Hebrew Bible several times as a city of ancient Moab (). While the exact location is unknown, it is likely to have been in the southern part of the Arnon Valley, which is the present day Wadi Mujib gorge in Jordan. The city ...

, in ancient Moab * Appenzell Ausserrhoden, Switzerland * Province of Arezzo, Italy, vehicle registration code *

Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...

(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 Arkansas ( ) is a landlocked state in the South Central United States. It is bordered by Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the south, and Texas and Oklahoma to the west. Its name is from the O ...

, 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 Affirmative Repositioning (AR) is a leftist political movement in Namibia mainly focused on land reform, youth empowerment and social reform. Founded in 2014 by Job Amupanda, Dimbulukeni Nauyoma and George Kambala, the AR uses social media platf ...

, a political movement in Namibia *

Animal rights Animal rights is the philosophy according to which many or all Animal consciousness, sentient animals have moral worth that is independent of their Utilitarianism, utility for humans, and that their most basic interests—such as avoiding s ...

, a philosophy * Animal rights movement, a social movement advocating for other animals * Antipodean Resistance, an Australian neo-Nazi group

Other uses

* 🜇 or AR, a numismatic abbreviation for "silver" *

Argent In heraldry, argent () is the tincture of silver, and belongs to the class of light tinctures called "metals". It is very frequently depicted as white and usually considered interchangeable with it. In engravings and line drawings, regions to ...

, the heraldic tincture of silver * Assistant referee (association football) *

Auto rickshaw An auto rickshaw is a motorized version of the pulled rickshaw or cycle rickshaw. Most have three wheels and do not tilt. They are known by many terms in various countries including auto, auto rickshaw, baby taxi, mototaxi, pigeon, jonnybee, bajaj ...

, 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