| Acronym | Meaning |
| MRF | Measurements/Stimuli Request Form |
| AEPI | Atmospheric Emissions Photo Imaging |
| R/E | Reentry |
| DL | DeveloPment-Left |
| IPS | IRL Initiating Reference Letter |
| OC | On Center |
| HIPC | High Chamber Pressure |
| M | Monitor (MON Preferred) |
| PLSS | Primary Life SuPport Subsystem |
| ITS | Instrumentation Telemetry Station |