| Acronym | Meaning |
| EGRET | Energetic Gamma Ray Experiment Telescope |
| IVT | Interface Verification Test |
| DCX | Delta Clipper EXperimental |
| S/C | SpaceCraft |
| LIS | Lightning Imaging Sensor |
| ESO | European Southern Observatory |
| ASCO | Arab Satellite Communications Organization |
| TAU | Thousand Astronomical Unit |
| HRSC | High Resolution Stereo Camera |
| MFV | Main Fuel Valve |