| Meaning | Category |
| Radar Effects Reactor | Governmental->Military |
| Radiation Effects Reactor | Academic & Science->Chemistry |
| Radiation Effects Report | Academic & Science->Chemistry Governmental->Military Governmental->US Government |
| Rare Earth Research | Academic & Science->Chemistry |
| Real Estate Roundtable | Business->Firms |
| Recovery Expense Report | Governmental->Military Governmental->NASA Governmental->Transportation |
| Recovery and Evacuation Report | Governmental->Military |
| Regional Economic Research, Inc. | Business->Firms |
| Remediation Effectiveness Report | Governmental->US Government |
| Remote REadout | Governmental->Military Governmental->NASA |
| Rental Equipment Register | Business->Firms |
| Repair Effectiveness Report | Governmental->Military Governmental->NASA Governmental->Transportation |
| Request for Engineering Release | Governmental->Military Governmental->NASA |
| Rerun | Community->Media |
| Research Expenditure Report | Business->General Business->International Business Governmental->Military Governmental->NASA Governmental->Transportation Governmental->US Government |
| Reseau Express Regional | Governmental->Transportation |
| Respiratory Exchange Ratio | Medical->Physiology |
| Resting Energy Rate | Medical->Veterinary |
| Restricted Equipment Requirement | Governmental->Military |
| Reusable - Expendable - Reusable | Governmental->Military Governmental->NASA |
| Rough Endoplasmic Reticulum | Medical->Human Genome Medical->Physiology |
| Rubberized Equipment Repair | Governmental->Military Governmental->NASA Governmental->Transportation |
| Réseau express régional | International->French |
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