| Acronym | Meaning |
| CW | Continuous Wave |
| EGRET | Energetic Gamma Ray Explorer Telescope |
| BARB | Ballast Aerating Retrieval Boom |
| PPM | Pulse Position Modulation |
| SCOS | Subsystem Computer Operating System |
| ECP | Explicitly Coded Program |
| SR | Standard Repair |
| KIP | Keyboard Input Processor |
| RIL | Reparableltemlist |
| VDD | Verification Description Document |