| Abbreviation | Definition |
|---|---|
| PRESS | Pressurant |
| PRESS | Pressure |
| PREV | Previous |
| PREVLV | Prevalve |
| PREVLV | PRE-VaLVe |
| PRF | Parachute Refurbishment Facility |
| PRF | Pulse Repetition Frequency |
| PRIM | Primary |
| PRL | Page Revision Log |
| PRL | Priority Rate Limiting |
| PRM | Payload Retention Mechanism |
| PRM | Posigrade Rocket Motor |
| PRM | Pulse Rate Modulation |
| PRN | Program Release Notice |
| PRN | Pseudo-Random Noise |
| PRN | Pulse Range Navigation |
| PRO | Proceed |
| PROB | Problem |
| PROBE | Plankton Research On the Bay Environment |
| PROC | Procedure |