Optical Character Reader - Computer science (AD)
Captain O'Connell's Boat Sales, Tonawanda, NY - Manufacturer code for watercraft hull identification number (USCG)
Creemore Public Library, Ontario - Library symbol - National Library of Canada (BIB)
Norcross, GA - Location identifier - FAA (FAAL)
Occupational Safety and Health Control Report - Navy
Occurrence (SAUS)
Ocean Colour Radiometer (SAUS)
O'Connell Ranch - California - Seismograph station code, US Geological Survey (SEIS)
Ocular Counterrolling - A vestibuloocular reflex
Oculocardiac Reflex - Physiology
Off-Center Ratio (RAWO)
Office for Civil Rights - Department of Education
Office of Civilian Requirements - Division of War Production Board - World War II
Office of Civil Rights - Environmental Protection Agency (GFGA)
Office of Coal Research - Energy Research and Development Administration
Office of Collateral Responsibility (AFM)
Office of Community Relations (COE)
Office of Coordinating Responsibility - Air Force
Office of Corollary Responsibility (ACAE)
Office of the County Recorder (AD)
Oil Circuit Recloser
Oil Control Ring - Automotive engineering
Oklahoma Central Railroad - Federal Railroad Administration identification code
Omnicare, Inc. - NYSE symbol (SPSG)
Operational Capability Release
Operational Capability Requirement (SAUS)
Operational Change Report - Military (NVT)
Operational Concept Review (ACAE)
Operational Control Record - Nuclear energy (NRCH)
Operations Capability Reference (SSD)
Operations Control Room - Military (CAAL)
Optical Card Reader (SAUS)
Optical Character Reader - Computer science
Optical Character Recognition - Computer science
Optical Character Resolution - Ligature Co.
Optical Code Reader (or Reading) (SAUS)
Optical Curve Recognition (SAUS)
Opticat Character Recognition (SAUS)
Optimum Change Regulator (SAUS)
Optimum Charge Regulator
Optional Character Reader - Computer science (DA)
Oracle Resources - Vancouver Stock Exchange symbol
Order Change Record (SAUS)
Order Control Record (SAA)
Order of Corporate Reunion - British
Order of the Crown of Rumania
Ordo Reformatorum Cisterciensium - Cistercians, Trappists - Roman Catholic men's religious order
Organic-Cooled Reactor - Nuclear energy (OA)
Organisation for the Collaboration of Railways - See also OSShD - Warsaw, Poland (EAIO)
Organization Change Request
Organization of work Camps of the Revolution (SAUS)
Organized Crime and Racketeering Section - Department of Justice (DLA)
Output Control Register
Over Consolidated Ratio - Nuclear energy (NUCP)
Overcurrent Relay (MSA)
Overhaul Component Requirement - NASA (KSC)
Overhead Component Requirement (IAA)
Oxidizable Carbon Ratio
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