| Acronym | Meaning |
| NBS | National Bureau Of Standards |
| POV | Pneumatic Operated Valve |
| MRTC | Multiple Real-Time Commands |
| TRB | Test Review Board |
| SCD | Specification Control Document |
| SST | Subsystem Terminal On Spacelab |
| FCOS | Flight Computer Operating System |
| RCU | Remote Control Unit |
| NSTL | National Space Technology Laboratory (was MTF) |
| CIG | Communications And Interface Group |