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What does O stand for?

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Rank Abbr.Meaning
OOh
OOfficial
OOrganization
OOutdoor
OOrange
OOut (baseball)
OOperations
ONew Orleans, Louisiana (mint mark)
OOscar (aviation letter code)
OOutput
OOutstanding
OOffensive (Catholic movie rating)
OOrgasm
OOrtho (Benzene)
OOxygen
OHug(s)
OOperational
OObserver
OOrganizational
OOrder of Magnitude (computer algorithms)
OOxide
OOtis (Redding)
OOfficer (military)
OImmediate (logging abbreviation)
OOdin
oOhm
OOscar Robertson (former NBA player)
OOprah (magazine)
OOuest (French: west)
OOthello
OOperator (telephone)
OObservation (US military aircraft designation; as in O-1)
OOctal
OOrthogonal (mathematics)
OObstacle (course)
ODefensive Team (sports/coaching)
OOmit
OOutliers
OOmikron (German: Omicron; 15th letter of the Greek alphabet)
OOberst (German)
OOver to You (radio communications)
OMorally Offensive (Catholic movie rating)
OOrigin Server (Internet)
OOptional Levels (board test for high schoolers, UK)
OOhne Hauch (antigen)
OOst/Osten (German: East)
OMeasurement of Cloud Cover
OToy train railroad gauge (2 1/4 inch wide, originated in Germany)
OOfficer of Operations (US Navy)
OOrganized Naval Reserve (US Navy)