| Abbreviation | Definition |
|---|---|
| PORD | Performance and Operations Requirements Document |
| PORR | Preliminary Operations Requirements Review |
| PORT | Portable |
| POS | Pacific Ocean Ship |
| POS | Portable Oxygen System |
| POS | POSition |
| POSSE | Pluto And Outer Solar System Explorer |
| POST | Payload Operations Support Team |
| POST | Positive |
| POST | Program to Optimize Simulated Trajectories |
| POT | Potable |
| POT | Potentiometer |
| POV | Peak Operating Voltage |
| POV | Pneumatic Operated Valve |
| POWS | Project Operating Work Statement |
| PP | Partial Pressure |
| PP | Planning Package |
| PP | Post Pass |
| PP | Power Pole |
| PP | Program Performance |