| Acronym | Meaning |
| EGRET | Energetic Gamma Ray Explorer Telescope |
| PPEP | Plasma Physics And Environmental Perturbation |
| LLS | Launch And Landing Site |
| HSI | Horizontal Situation Indicator |
| EL | Electromagnetic Interference |
| FF | Flight Forward |
| PMS | Performance Monitoring System |
| CVT | Communications Vector Table |
| SS | Single Sideband |
| HIP | Hardware Interface Program |