| Acronym | Meaning |
 | OFI | Operational Flight Instrumentation |
| IN | Information Systems Directorate (KSC) |
| CO | Cutoff |
| INSTRUM | Instrumentation Subsystem |
| UTS | Urine Transfer System |
| PMU | Pulse Modulation Unit |
| CWEU | Caution And Warning Electronics Unit |
| PDU | Pilot Display Unit |
| EG | Entry Guidance |
| SGMT | Simulated Greenwich Mean Time |
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