AR, Ar or ar can mean:

• the letter R

Look up R, r in Wiktionary, the free dictionary. ...

Places, regions, languages

• Arabic language (ISO 639 alpha-2 language code)
• .ar, the ccTLD for Argentina
• Argentina, ISO 3166-1 alpha-2 and FIPS 10-4 digram country code
• Appenzell Outer Rhodes, Swiss canton
• Arkansas (United States postal abbreviations)

Arabic ( or just ) is the largest living member of the Semitic language family in terms of speakers. ... ISO 639 is one of several international standards that lists short codes for language names. ... .ar is the Internet country code top-level domain (ccTLD) for Argentina. ... A country code top-level domain (ccTLD) is a top-level domain used and reserved for a country or a dependent territory. ... ISO 3166-1 alpha-2 codes are two-letter country codes in the ISO 3166-1 standard to represent countries and dependent areas. ... Appenzell Ausserrhoden (German; French: Appenzell Rhodes-Extérieures; in English sometimes Appenzell Outer Rhodes) is a canton of Switzerland. ... The twenty-six cantons of Switzerland are the states of the federal state of Switzerland. ... Official language(s) English Capital Little Rock Largest city Little Rock Area  Ranked 29th  - Total 53,179 sq mi (137,002 km²)  - Width 239 miles (385 km)  - Length 261 miles (420 km)  - % water 2. ... The following is a list of abbreviations used by the United States Postal Service. ...

Medicine, technology, science, mathematics, economics

• Applied Relaxation, a form of behavioral therapy used for depression, anxiety, etc.
• Artificial Respiration, a cardio-respratory technique for lifesaving.
• Aortic Regurgitation, a heart valve disease
• Autoregressive, stochastic process in Econometrics
• Silver, in the field of numismatics (from the Latin Argentum)
• Analytical Reagent, such as Zinc acetate, Mandelic acid or Perchloric acid
• Argon, chemical symbol
• Armalite, maker of the AR-15, a popular Assault Rifle

Wikibooks has a book on the topic of First Aid Artificial respiration is a technique for providing air for a person who is not breathing on their own, but whose heart is still beating. ... Aortic insufficiency (AI), also known as aortic regurgitation (AR), 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. ... In statistics, autoregressive moving average (ARMA) models are typically applied to time series data. ... Econometrics literally means economic measurement. It is a combination of mathematical economics and statistics. ... General Name, Symbol, Number silver, Ag, 47 Chemical series transition metals Group, Period, Block 11, 5, d Appearance lustrous white metal Atomic mass 107. ... Numismatics is the scientific study of currency and its history in all its varied forms. ... Zinc acetate is a preparation of zinc used as a dietary supplement and in lozenges used to treat the common cold. ... Mandelic acid, also called phenylglycollic acid, (C8H8O3) (C6H5•CH(OH)•OOH), is an isomer of cresotinic acid and oxymethylbenzoic acid. ... Perchloric acid has the formula HClO4 and is a colorless liquid soluble in water. ... General Name, Symbol, Number argon, Ar, 18 Chemical series noble gases Group, Period, Block 18, 3, p Appearance colorless Atomic mass 39. ... ArmaLite, originally the ArmaLite Division of the Fairchild Engine and Airplane Corporation, is one of the most influential corporations in the history of 20th century small arms. ... The AR-15 is a lightweight, air-cooled, magazine-fed, autoloading, centerfire rifle. ... The AK-47 is the worlds most common assault rifle. ...

Computer related

• ar is a Unix archive format and handling tool
• Activation record, a computer science term for the set of data regarding an active subroutine, stored within the stack.
• Augmented reality, an opposite of virtual reality
• Accelerated Reader, educational reading assessment software

The archiver (also known simply as ar) is a UNIX utility that maintains groups of files as a single archive file. ... Filiation of Unix and Unix-like systems Unix (officially trademarked as UNIX®) is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T employees at Bell Labs including Ken Thompson, Dennis Ritchie and Douglas McIlroy. ... In computing, a stack frame is a data structure used to create temporary storage for data and saved state in functions. ... Augmented reality (AR) is a field of computer research which deals with the combination of real world and computer generated data. ... Virtual reality (VR) is a technology which allows a user to interact with a computer-simulated environment, be it a real or imagined one. ... Accelerated Reader (AR) is a daily progress monitoring software assessment in wide use by primary and secondary schools for monitoring the practice of reading, and it is created by Renaissance Learning, Inc. ...

Computer games

• Action Replay, Video game device
• Abandoned Realms [1], a MUD game
• Abandonia Reloaded, a freeware games web community.
• Alternate Reality, a Primary Racial Trait in the 4X-type computer game Stars!
• Armadillo Run, a physics-based, independently developed computer game.

Action Replay cartridge for Amiga 500. ... Namcos Pac-Man was a hit, and became a cultural phenomenon. ... In computer gaming, a MUD (Multi-User Dungeon, Domain or Dimension) is a multi-player computer game that combines elements of role-playing games, hack and slash style computer games and social chat rooms. ... It has been suggested that this article or section be merged with Abandonia. ... This article or section does not adequately cite its references or sources. ... 4X refers to a genre of strategy game, usually a computer game, with four primary goals: eXplore, eXpand, eXploit and eXterminate. ... Namcos Pac-Man was a hit, and became a cultural phenomenon. ... It has been suggested that Mystery Trader be merged into this article or section. ... Armadillo Run is the title of a physics-based puzzle computer game created by Peter Stock. ...

Businesses, organizations, groups, publications

• Arkadium-Developer of online game software for the advergaming and casual game markets.
• Acoustic Research, a brand name of Audiovox
• Aberdeen and Rockfish Railroad, (AAR reporting mark)
• Atlantic Records
• Aerolíneas Argentinas, IATA airline designator
• The Arizona Republic, a newspaper published in Phoenix, Arizona
• Armalite, an American arms manufacturer (e.g. AR-15 or any rifle of the same pattern)
• Army Regulation, a publication in the family of Field Manuals, Training Manuals, etc.

Acoustic Research was a company which manufactured high fidelity equipment in Cambridge, Massachusetts. ... Audiovox (NASDAQ: VOXX) is an electronics company. ... The Aberdeen and Rockfish Railroad (AAR reporting mark AR) is a shortline operating in North Carolina. ... A World War II era print advertisement for the Association of American Railroads (AAR). ... Atlantic Records (Atlantic Recording Corporation) is an American record label, and operates as a wholly owned subsidiary of Warner Music Group. ... Aerolíneas Argentinas A340-200. ... The Arizona Republic is a newspaper published in Phoenix, Arizona. ... ArmaLite, originally the ArmaLite Division of the Fairchild Engine and Airplane Corporation, is one of the most influential corporations in the history of 20th century small arms. ... The AR-15 is a lightweight, air-cooled, magazine-fed, autoloading, centerfire rifle. ...

Culture and history

• American Revolution
• Animal Rights, among animal rights activists
• Argent, the heraldic tincture of silver
• Accounts Receivable, an accounting term
• Repair Ship, U.S. Navy hull classification symbol
• the ᛅ rune of the Younger Futhark

John Trumbulls Declaration of Independence, showing the five-man committee in charge of drafting the Declaration in 1776 as it presents its work to the Second Continental Congress The American Revolution refers to the period during the last half of the 18th century in which the Thirteen Colonies that... A civet, or sea fox, photographed in the Zigong Peoples Zoo, Sichuan, 2001. ... ==Criminal Life == AL-Hamad is a Homosexual petifile with 135. ... Accounts receivable is one of a series of accounting transactions dealing with the billing of customers who owe money to a person, company or organization for goods and services that have been provided to the customer. ... The United States Navy (USN) is the branch of the United States armed forces responsible for naval operations. ... The United States Navy uses hull classification symbols (sometimes called hull codes) to identify the types of its ships. ... Jera Jāra or Jēra harvest, (good) year is the reconstructed Proto-Germanic name of the j-rune ᛃ. In the Anglo-Saxon Futhorc, it is continued as ᛄ Gēr and ᛡ Ior, the latter being a bind rune of Gyfu and Is (compare also ᛠ Ear). ... Technical note: Due to technical limitations, some web browsers may not display some special characters in this article. ...

Fiction

• Arlesdale Railway, a fictional railway in the Railway Series by W.V. Awdry

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