Places
* Ann Arbor (Amtrak station) (Amtrak station code) * Ann Arbor Municipal Airport (IATA airport code)Brands and enterprises
* ARB, Inc., predecessor of Primoris Services Corporation * American Research BureauComputing
* Arb, an interval arithmetic package related to GNU MPFR * OpenGL Architecture Review Board ** ARB assembly language, for GPU instructionsFinance, economics, and business
* muni arb or municipal bond arbitrage * Arbitrage bettingGovernment
* Administrative Review Board (Labor) of the US Department of Labor * Air Resources Board, California Environmental Protection Agency *Language
* Arb (gesture), hand signals used on financial trading floors * Modern Standard Arabic (ISO 639-3 code)Military
* Administrative Review Board, for prisoners in the Guantánamo Bay detention camps * Air Rescue BoatScience, engineering, and health care
* Accumulative roll bonding of metal sheets * Angiotensin II receptor blocker, a blood pressure medication * ARB Project, for phylogenetic analysis * Arbitrary unit or arb unit * Royal Academies for Science and the Arts of Belgium (french: Académie Royal de Belgique, link=no)Sports
* ARB (martial art), a Russian martial art * Australian Racing Board for horse racingTransportation
* Arbroath railway station, UK (National rail code) * Arth-Rigi-Bahn, a Swiss mountain railwayOther uses
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