| Acronym | Meaning |
 | ENAP | Energetic Neutral Atom Precipitation |
| HRSR | High-Resolution Scanning Radiometer |
| NSA | National Security Agency |
| HRMS | High Resolution Microwave Survey |
| UPPP | Union Pour La Promotion De La Propulsion Photonique |
| RFI | Radio Frequency Interference |
| HRI | High Resolution Imager |
| GPC | General Purpose Computer |
| GEM | Giotto Extended Mission |
| SAGA | Solar Array Gain Augmentation |
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