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What does O/B stand for?

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Rank Abbr.Meaning
OBObstetrics
OBOut (of the) Blue
O/BOn Board
OBObligation
OBOn Board
OBOberbürgermeister (German: mayor of a larger city)
OBObservatory
OBObsolete
OBObedience
OBOutside Broadcast
OBOak Bluffs (Massachusetts)
ObObligatory
OBOboe
OBOld Boy
O/BOn Behalf
OBOingo Boingo (band)
OBOskar Blues (brewery; Colorado)
OBOcean Beach (California)
OBOctave Band
OBOpen Box
OBOpen Box (gaming clan)
OBOld Babylonian
OBOrder of Battle
OBOutboard
OBOh Baby
OBOccult Blood
OBOut of Bounds (National Park Service or golf slang)
OBOgre Battle (game)
OBOlfactory Bulb
OBOutward Bound
OBOil-Based
OBOberkommando (German: High Command)
OBOfficial Business
OBOperating Budget
OBOrlando Bloom (actor)
OBObex (neuroanatomy, part of brain)
OBOpening Balance (financial management)
OBObliterative Bronchiolitis
OBOrdnance Battalion (US Navy)
OBOut of Business
OBOptical Bench
OBOld Bill (UK police)
OBOpen Burning (outdoor fire regulation)
OBOperating Base (US Navy)
OBOrganization Behaviour
OBOff Break (cricket)
OBOld Bastard
OBOperational Base (various locations)
OBOverbought (stock market)
OBOperation Battleaxe (gaming)
OBOversight Board
OBOhne Befund (German: Results Negative)
OBOutstanding Balance
OBOrdnance Board (US Navy)
OBOxbridge (summer program)
OBOfficial Building
OBOdense Boldklub (Danish soccer club)
OBOptical Branch
OBOberkommandierender (German CINC)
OBOutlet Box (electrical)
OBOffice of Budget
OBOver Board
OBOriginal Budget
OBOpen Billing
OBOutdoor Broadcasting
OBOrdinary Break (railway defect)
OBOhne Binde (German: without a pad; tampon brand)
OBOver Burden (mining)
OBOrganization Block
OBObservatoire de Besançon
OBOutbye (mining)
OBOssewa Brandwag
OBOssewa Brandwag (Ox-Wagon Guard)
OBOperation Barnabas
OBOnlinebandit (gamesite)
OBOutcast Bandicoot (fanfiction)
O/BOctanol/Buffer (biopharmaceuticals)
OBOld Bedfordian (Bedford School, UK)
OBOphodni Brod (Croatian: patrol boat)
OBOuter Beings (gaming)
OBOpen Along Bit Lines
O/BOxymorphone-Bupivacaine (drug combination)

Note: We have 18 other definitions for O/B in our Acronym Attic