| Acronym | Meaning |
 | MIS | Mission Information Subsystem |
| CI | Course (deviation Display) Invalid |
| MDM | Multiplexer/demultiplexer |
| OSF | Office Of Space Flight (now OSTS) |
| PRS | Personnel Rescue System |
| REI-N4 | REI-N4011ite Cation |
| EMF | Electromotive Force |
| KCS | Keyboard Configuration Studies |
| TRN | Trunnion |
| SEM | Seller's Engineering Memo |
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