| Acronym | Meaning |
 | SBTC | Speed Brake/Thrust Controller |
| IPS | IRG Inertial Rate Gyro |
| GUID | Guidance |
| PGWG | Particles And Gasses Working Group |
| HSD | Hamilton Standard Division |
| LB | Lower Brace |
| LS | Launch Sequence |
| HD | Highly Desirable |
| OFS | Orbital (Orbiter) Flight System |
| OLF | Orbiter Landing Facility (now SLF) |
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