| Abbreviation | Definition |
|---|---|
| PSE | Payload Servicing Equipment |
| PSE | Payload Support Equipment |
| PSE | Peculiar Support Equipment |
| PSF | Payload Servicing Structure |
| PSF | Point Spread Function |
| psf | Pounds Per Square Foot (lb/ft2 preferred) |
| PSF | Processing and Staging Facility (SRB) |
| PSF | Processing and Storage Facility (ET) |
| PSFC | Power Supply/Fuel Cell |
| PSG | Power Subsystem Group |
| PSI | Pounds per Square Inch (lb/in2 preferred) |
| PSI | Power Static Inverter |
| psid | Pounds Per Square Inch Differential |
| psig | Pounds Per Square Inch Gauge |
| PSIG | Propulsion Systems Integration Group |
| PSIS | Pounds per Square Inch Sealed |
| PSK | Phase-Shift Keying |
| PSL | Perpendicular to the Sun Line |
| PSL | Pressure Seal |
| PSL | Propellant Seal |