| Acronym | Meaning |
 | TBC | Terminal Buffer Controller |
| IOCU | Input/Output Control Unit |
| EPL | Emergency Power Level |
| LOS | Input/Output Supervision |
| GND | C/0 GrGND C/0 Ground Checkout |
| IACS | Inertial Attitude Control System |
| NPC | NASA Publication Control |
| CEQ | Council On Environmental Quality |
| SCS | Stabilization And Control SYstem (Subsystem) |
| M/U | Mockup |
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