| Acronym | Meaning |
| IPS | IPTCSInternational Pipe Thread |
| PGNCS | Primary G&N And Control System (Subsystem) |
| CL | Closed Loop Contro! Logic |
| RTHC | Rotation-Translation Hand Controller |
| EFFGRO | Efficient Growth (Computer Program) |
| MEIG | Main Engine Ignition |
| RO | Recovery Operations |
| IP | Impact Point |
| TOPS | Transistorized Operational Phone System |
| SCDP | Simulation Control Data Package |