| Meaning | Category |
| Radar Control Operator | Governmental->Military |
| Ramco Energy, PLC | Business->AMEX Symbols |
| Range Control Officer | Governmental->NASA |
| Recycling Council of Ontario | Business->Professional Organizations |
| Refined Chemical Oil | Business->Products |
| Regenerative Catalytic Oxidizer | Academic & Science->Chemistry Governmental->Transportation |
| Regional Campus Organizer | Academic & Science->Universities |
| Regional Certification Officer | Governmental->State & Local |
| Regional Church Office | Community->Religion |
| Regional Co-ordination Officer | Governmental->Environmental |
| Regional Communications Officer | Governmental->Military |
| Regional Compliance Officer | Governmental->Environmental |
| Regional Consular Office | Governmental->US Government |
| Regional Contracting Office | Governmental->Military |
| Regional Control Office | Governmental->Transportation |
| Regional Coordinating Officer | Community->Non-Profit Organizations |
| Regional Coordinating Organization | Business->Firms |
| Regional Currency Office | Governmental->US Government |
| Remote Communications Outlet | Governmental->Transportation |
| Remote Computing Options | Computing->Networking |
| Reports Clearance Officer | Governmental->United Nations |
| Reservations, Commitments, and Obligations | Governmental->US Government |
| Residential Communities Office | Community Governmental->State & Local |
| Rifle Combat Optic | Governmental->Military |
| Rio Rico Resort Country Club | Community->Sports |
| Rochefort, France | Regional->Airport Codes |
| Rotary CutOff | Business->Products |
| Russian Carnivorous Octopi | Medical->Veterinary |
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