| Abbreviation | Definition |
|---|---|
| PAM-D | PAM, Delta Class Spacecraft |
| PAN | Planetary Art Network |
| PAR | Planning Action Request |
| PAR | Problem Accountability Record |
| PAR | Problem Action Record |
| PAR | Problem Action Request |
| PAR | Product Acceptance Review |
| PARA | PARAgraph |
| PARAM | Parameter |
| PARC | Palo Alto Research Center |
| PARS | Property Accountability Record System |
| PARTS | Parts Assembly And Reuse Tool Set |
| PAS | Payload Accommodation Studies |
| PAS | Primary Ascent System |
| PASM | Power Actuation And Switching Module |
| PASS | Planning And Scheduling System |
| PASS | Primary Avionics Software System |
| PAT | Problem Action Team |
| PAT | Production Acceptance Test |
| PATP | Preliminary Authority To Proceed |