| Abbreviation | Definition |
|---|---|
| PGNCS | Primary Guidance & Navigation and Control System |
| PGOC | Payload Ground Operations Contractor |
| PGOR | Payload Ground Operation Requirements |
| PGORS | Payload Ground Operations Requirements Study |
| PGOWG | Payload Ground Operations Working Group |
| PGR | Spacelab Planning and Ground Rule |
| PGRWG | Payload Ground Requirements Working Group |
| PGS | Phantom Glove Syndrome |
| PGS | Power Generation Subsystem |
| PGS | Preliminary Gravity Solution |
| PGSE | Payload Ground Support Equipment |
| PGSM | Payload Gimbal Separation Mechanism |
| PGU | Plant Growth Unit |
| PGWG | Particles and Gasses Working Group |
| pH | Hydrogen-Ion Concentration (Alkalinity) |
| PH | Personal Hygiene |
| PH | Phase |
| PHA | Potentially Hazardous Asteroids |
| PHA | Preliminary Hazard Analyses |
| PHA | Pulse Height Analyzer |