| Acronym | Meaning |
| EXOSAT | European X-ray Observatory Satellite |
| ALA-O | Delta-aminolevulinic Acid Dehydrates |
| MPP | Massively Parallel Processor |
| GTF | Ground Test Facility |
| EURATOM | European Atomic Energy Agency/Community |
| D&F | Determination And Findings |
| A/I | Accident/incident |
| NWRC | National Weather Records Center |
| DCO | Delayed Compliance Order |
| MSOCC | Multisatellite Operations Control Center |