| Abbreviation | Definition |
|---|---|
| PFRX | Preflight Relmat (X-1,2,3...9 or A,B,C...Z) |
| PFS | Percent Full Scale |
| PFS | Primary Flight System |
| PFTA | Payload Flight Test Article |
| PG | Peptidoglycan |
| PG | Power Generation |
| PG | Pressure Gage |
| PGA | Power Generating Assembly |
| PGA | Pressure Garment Assembly |
| PGA | Programmable Gain Amplifier |
| PGBA | Plant Generic Bioprocessing Apparatus |
| PGC | Plant Growth (unit) |
| PGC | Plant Growth Chamber |
| PGCP | Particles and Gases Contamination Panel |
| PGDCS | Power Generation, Distribution, and Control Subsystem |
| PGE | Purge |
| PGG | Project Galactic Guide |
| PGHM | Payload Ground Handling Mechanism |
| PGM | Program(able) |
| PGNCS | Primary G&N and Control System (Subsystem) |