| Acronym | Meaning |
| PMS | Performance Management System |
| PDM | Pulse Duration Modulation |
| VO | Voice |
| SSPRO | Space Shuttle Program Resident Office |
| SEI | SYstem Engineering Groundrule |
| NT | Newton |
| M | Meter |
| UMO | Unmanned Orbital |
| CDS | Collision Detector System |
| OTA | Optical Telescope Assembly |