| Acronym | Meaning |
| FCOS | Flight Computer Operating System (Orbiter) |
| MILS | Missile Impact Location System |
| PCM | Pulse Code Modulation |
| DCS | Design Communication System |
| EUV | Extreme Ultraviolet |
| LAT | Latch |
| SEPAP | Shuttle Electrical Power Analysis Program |
| CCRF | Consolidated Communication Recording Facility |
| EU | Experimental Unit |
| GETIL | Ground Elapsed Time Of Landing (for TIG Of |