English abbreviations from opus to or-s
- OPUS(Optimising Public Understanding of Science)
- OPV(Observation Post Vehicle)
- OPW(Orthogonalized Plane Wave)
- OPWSA(Ontario Provincial Women's Softball Association)
- OPX(Open Philanthropy Exchange)
- OPZONE(Operation Zone)
- OQ(Order Quantity, in inventory management; the quantity of new items to be ordered. Often expressed as a part of OP/OQ (when quantity OP is reached, order OQ new items))
- OQA(Office of Quality Assurance)
- OQB(Opera Quarter Bar (London))
- OQE(Organization for Quality Education)
- OQF(Ordnance Quick Firing)
- OQG(Output Queue Grant)
- OQH(Online Quiz Hell)
- OQLF(Office Québécois de la Langue Française)
- OQM(Oxfordshire Quality Musclebuilding)
- OQN(Brandywine Airport)
- OQR(Office of Quality Review)
- OQS(Occupied Quantum State)
- OQT(Officer Qualification Testing)
- OQZ(Operational Quality: Zilch)
- OR(Operating room)
- Or.(Oratio ("Prayer" Breviary))
- OR(s)(Odds ratio(s))
