| Acronym | Meaning |
 | SSC | Subsystem Computer |
| RTCL | Reticle |
| CPES | Crew Procedures Evaluation (Evaluator) Simulator |
| IPC | Intermittent Positive Control |
| IOB | InPut/Output Buffer (if Bus |
| VFO | Variable Frequency Oscillator |
| MCP | Master Change Proposal |
| PH | Hydrogen-Ion Concentration (Alkalinity) |
| DHS | Discrete Horizon Sensor |
| ICWG | Interface Control Working Group |
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