| Abbreviation | Definition |
|---|---|
| RAD | Roentgen Absorbed Dosage |
| RAD | Roll Attitude Determination |
| RADCC | Radiation Control Center |
| RAE | Radio Astronomy Explorer |
| RAF | Requirements Analysis Form |
| RAG | Reusable Agenda |
| RAHF | Research Animal Holding Facility |
| RAI | Radar Altimeter Indicator |
| RAI | Roll Attitude Indicator |
| RAISE | Rigorous Approach to Industrial Software Engineering |
| RAL | Responsibility Assignment List |
| RAL | Rutherford Appleton Laboratory, UK |
| RALPH | Reduction and Acquisition of Lunar Pulse Heights |
| RALT | Radar Altimeter |
| RAM | Radar Absorptive Material |
| RAM | Research and Applications Module |
| RAM | Responsibility Assignment Matrix |
| RAMA | Recap and Movement Authorization |
| RAMBO | RAM Burn Observation |
| RANC | Radar Absorption Noise and Clutter |