What does 'Or stand for?

'Orlah (BJA)

Air Comores - ICAO designator (AD)

Beginning of Record (SAUS)

Oahu Railway - Federal Railroad Administration identification code

Oak Ridge Complex - Department of Energy - Oak Ridge National Laboratory (GAAI)

Oak Ridge Operations Office (DOGT)

Objective Reliability (MCD)

Object-Relational (GART)

Object Routine (SAUS)

Observed Ratio (MCD)

Observer, Right (SAUS)

Occurrence Report (ABAC)

Octane Rating - Automotive engineering

Octane Requirement - Fuels and lubricants

Odds Ratio - Statistics

Officer of Reserve (SAUS)

Officer Records - Military (AFM)

Official Receiver

Official Records - Of the War of the Rebellion - Civil War term

Official Referee

Official Reports, South Africa - A publication (DLA)

Official Requirement (SAUS)

Off-Radial

Off-Route - Telecommunications (OTD)

Ohms, Resistance (SAUS)

Oil Rehabilitation Committee - British

Oil Resistance (SAUS)

Oil Retention - Enema - Medicine

Oil Ring (MSA)

Oldenburg Registry - Association (EA)

Old Roman (ADA)

Oleoresin - Also, Ol Res - Pharmacy

Oleoresinous (SAUS)

Olfactory Receptor - Biochemistry

Oligomer Restriction - Genetics

Olympic Range (SAUS)

Olympic Record (SAUS)

Omega Rho (SAUS)

Omnidirectional Radio Range (MCD)

On Rail (SAUS)

On Return

Ontario Reports - A publication (DLA)

Open Reduction - Orthopedics (DAVI)

Open Registry - Flag of convenience - Shipping (DS)

Open Routine (SAUS)

Operand Register (VLIE)

Operating Ratio - Income divided by expenses

Operating Reactor - Nuclear energy (NRCH)

Operating Resources (AFM)

Operating Revenue (SAUS)

Operating Room - Medicine

Operational Equipment Requirement (IAA)

Operationally Ready (MCD)

Operational Readiness - Army

Operational Recorder (SAUS)

Operational Reliability - Army (AABC)

Operational Report (AAG)

Operational Requirement

Operational Research

Operational Right

Operational Right DSC or MDM (SAUS)

Operation Rate (SAUS)

Operation Reach-Out - Department of Labor

Operation Record

Operation Rescue (EA)

Operation Research (SAUS)

Operations and Regulations (SAUS)

Operations Request - Military

Operations Requirements

Operations Research - Computer science

Operations Review - NASA (MCD)

Operations Room

Operator (IAA)

Operator Register (SAUS)

Operator Routine (SAUS)

Operculum Ridge

Ophthalmic Rete - Bird anatomy

Opponents' Runs - Baseball

Optical Reader - Computer science (BUR)

Optical Receiver (SAUS)

Optic Radiation (DB)

Oral Rehydration - Medicine (MELL)

Orange

Oratorians

Orbital Rhabdomyosarcoma - Medicine (EDAA)

Ordered Recorded

Ordering Register (IAA)

Orderly Room

Order of the Road - British (DBA)

Order Pennant - Navy - British

Order - or Ordering Register (SAA)

Order Release (SAUS)

Ordinance Report (SAUS)

Ordnance Requirement

Oregon - Postal code

Ore Reserve (SAUS)

Organizational Representative (SAUS)

Organizational Research (SAUS)

Organized Reserves - Military

Organ Recovery (EA)

OR Gate (SAUS)

Orient

Oriental (ROG)

Orientation Ratio (VLIE)

Orientation Response (SAUS)

Oriented (SAUS)

Orienting Reflex - Medicine (MELL)

Orienting Response - Psychology

Origin (VLIE)

Original (ADA)

Originating Register (VLIE)

O-Ring - Automotive engineering

Orosomucoid - Biochemistry

Orthopaedic Review - Medicine - Journal (EDAA)

Orthopedic

Orthopedic Research - Medicine

Orthophthalic Resin - Plastics

Oswestry Rangers - British military (DMA)

Other (ROG)

Other Ranks - Ranks other than officers - Military

Outer Roll - Aviation (MCD)

Out of Range

Output Record (SAUS)

Output Register (MSA)

Output Routine (SAUS)

Outside Radius - Technical drawings

Outside Right - Soccer position

Overall Report

Overall Resistance (IAA)

Overflow Register (SAUS)

Overhaul and Repair

Overload Relay (KSC)

Over Run (MHDW)

Overrun (SAUS)

Oversea Requisition (SAUS)

Overseas Replacement - Military

Owasco River - AAR code

Owner's Risk - Shipping

Own Recognizance - Legal term

Oxidation Resistance (SAUS)

Oxide Removal (SAUS)

Oxygen Enchancement Ratio (IAA)

Oxygen Relief (NASA)

Renfrew Public Library, Ontario - Library symbol - National Library of Canada (NLC)

Operationally Risky (ODA)

Orthoclase - CIPW classification - Geology

Owner's Risk (WDAA)

Indian Law Reports, Orissa Series - A publication (DLA)

Oratio - A publication (OCD)

Orationes - of Julian - Classical studies (OCD)

Orationes - of Dio Chrysostomus - Classical studies (OCD)

Oregon (NTIO)

Oregon State Library, Salem, OR - Library symbol - Library of Congress (LCLS)

Oregon Supreme Court Reports - A publication (DLA)

Orestes - of Euripides - Classical studies (OCD)

Oriel College, Oxford (ODA)

Origen - Deceased circa 254 - Authority cited in pre-1607 legal work (DSA)

Orthoclase Feldspar