| Abbreviation | Definition |
|---|---|
| PR | Pressure Ratio |
| PR | Pressure Regulator |
| PR | PRimary |
| PR | Procurement Regulation |
| PR | Pulse Rate |
| PR | Purchase Request |
| PRA | Probabilistic Risk Assessment |
| PRAB | Program Risk Assessment Board |
| PRACA | Problem Reporting And Corrective Action |
| PRB | Panel Review Board |
| PRB | Parachute Refurbishment Building |
| PRB | Paso Robles (TACAN Station) |
| PRB | Project Review Board |
| PRC | People's Republic of China (Payload) |
| PRC | People's Republic of China Satellite |
| PRC | Physical Review C |
| PRC | Planning Research Corporation |
| PRCA | Problem Reporting and Corrective Action |
| PRCB | Program Requirements Change Board |
| PRCB | Program Requirements Control Board |