AR

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AR, Ar or ar can mean:

Places, regions, languages

Relative atomic mass;
Adrenergic Receptor, a class of G protein-coupled receptors;
Androgen receptor, a nuclear hormone receptor;
Anti-reflective coating, a coating on lenses that allows better light transmission through the lens;
Aortic Regurgitation, a heart valve disease;
Analytical Reagent, such as Zinc acetate, Mandelic acid or Perchloric acid;
AR-15, a popular Assault Rifle;
Argon, chemical symbol;
Armalite, maker of the AR-15, a popular Assault Rifle;
Artificial Respiration, a cardio-respratory technique for lifesaving;
Artist and repertoire
Autoregressive, stochastic process in Econometrics;
Silver, in the field of numismatics (from the Latin Argentum);

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

Abandonia Reloaded, a freeware games web community;
Action Replay, Video game device;
Air Rivals, a MMORPG/FPS, the new Space Cowboy;
Alternate Reality, a Primary Racial Trait in the 4X strategy computer game Stars!;
Armadillo Run, a physics-based, independently developed computer game;

A&R a part of the music industry;
Acoustic Research, a brand name of Audiovox;
Aberdeen and Rockfish Railroad, (AAR reporting mark);
Aerolíneas Argentinas, IATA airline designator;
Architectural Review, a publication of contemporary architecture;
Arizona Republic, a newspaper published in Phoenix, Arizona;
Armalite, an American arms manufacturer (e.g. AR-15 or any rifle of the same pattern);
Atlantic Records;

Alex Rider, a fictional book series, by author, Anthony Horowitz; and the character with the same name;
Ar, largest city on the fictional planet Gor, in the Gorean series by John Norman;
Arlesdale Railway, a fictional railway in the Railway Series by W.V. Awdry;