| Abbreviation | Definition |
|---|---|
| PLS | Preliminary Landing Site |
| PLS | Primary Landing Site |
| PLS | Propellant Loading System |
| PLSL | Propellants and Life Support Laboratory |
| PLSP | Payload Signal Processor |
| PLSS | Portable Life Support System |
| PLSS | Primary Life Support System |
| PLSSS | Primary/Portable/Personal Life Support System/Subsystem |
| PLT | Pilot |
| PLTS | Precision Laser Tracking System |
| PLUM | Payload Umbilical Mast |
| PLUTO | Please Let Us Take Off |
| PLV | Postlanding Vent |
| PLV | Post-Landing Vent |
| PLVC | Postlanding Vent Control |
| PLVC | Post-Landing Vent Control |
| PM | Payload Management |
| PM | Payload Midbody |
| PM | Performance Monitor |
| PM | Phase Modulation |