| Acronym | Meaning |
 | IUA | Inertial Unit Assembly |
| PL/SNSR | Payload Sensor |
| FWD | HT SHLDForward Heat Shield |
| PPB | Program Performance Baseline |
| FSLT | First Sea Level Test |
| ES | Experiment Segment |
| SIS | SiMUlator Interface SYstem (SubsYstem) |
| SSS | Stage Separation Subsystem |
| PTO | Participating Test Organizations |
| RREA | Rendezvous Radar Electronics Assembly |
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