| Acronym | Meaning |
| (AA3) | Accident Analysis Computer Program |
| APOLLO2 | RTD SRL Code For Operating Limits |
| LDAP | Lightweight Directory Access Protocol |
| AVS | Application Visualization System |
| LEDA | On-line Earthnet Data Access |
| FASCODE | Fast Atmosphere Signature Code |
| MUSE | Monitor Of Ultraviolet Solar Energy |
| AEN | Administrative Exception Note |
| IDCS | Image-dissector Camera System |
| PNA | Pacific/North American |