| Acronym | Meaning |
 | D | Down |
| CCS | Complex Control Set |
| OSE | Orbiter Support Equipment |
| PAR | Planning Action Request |
| HAC | Heading Alignment Cylinder |
| SOC | SYstem OPtion Controller |
| DFR | Defrost |
| GTI | Ground Test Instrumentation |
| NIB | NNIB Noninterference Basis |
| RJDF | Reaction Jet Driver Forward |
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