| Acronym | Meaning |
| LEO | Low Earth Orbit |
| LANL | Los Alamos National Laboratory |
| DACS | DATA Acquisition And Control Subsystem |
| ECS | Environmental Control System |
| CDS | Command And Data Subsystem |
| WTR | Western Test Range |
| PVO | Pioneer Venus Orbiter / Protivo-Vosdushniya Oborona |
| RNGC | Revised New General Catalog |
| PMS | Pre-Main Sequence |
| CZCS | Coastal Zone Color Scanner |