English abbreviations from orm to orta
- ORM(Operation Risk Management)
- ORMTA(Ontario Registered Music Teachers' Association)
- ORN(Oran Es Sénia Airport)
- ORNA(Oak Ridge Neighborhood Association)
- ORNL(Oak Ridge National Laboratory)
- ORO(Original Reusable Object)
- Or. Orat.(Orator ("Petitioner"), Oratorium ("Oratory"))
- ORP(Oxidation Reduction Potential)
- ORPC(Oundle Rifle and Pistol Club)
- ORQ(Ocean Racing Queensland Class Association, Inc.)
- ORR(Oak Ridge Reservation (U.S. DOE)||Office of Rail Regulation (UK government)||Office of Refugee Resettlement||(CIA) Office of Research and Reports||Operational Readiness Rate||Operational Readiness Review)
- ORRF(Operational Risk Research Foundation)
- ORS(Waterport Airport)
- ORSA(Oxacillin-resistant Staphylococcus aureus||Operations Research Society of America)
- ORSM(Off-Route Smart Mine)
- ORSMC(Off-Route Smart Mine Clearance)
- ORT(Northway Airport)
- ORTA(Office of Research and Technology Applications)
