| Acronym | Meaning |
| RJC | Reaction Jet Control |
| IVSI | Instantaneous Vertical Speed Indicator |
| LRECL | Logical Records Of Fixed Length |
| ODR | OutPut Data Redundancy |
| NAS | National Academy Of Sciences |
| DCU | Display And Control Unit |
| MTE | Multisystem Test Equipment |
| FM | Frequency Modulation (Modulated) |
| LOM | Input/Output Module |
| DP | Deployable Payload |