| Acronym | Meaning |
| GC | Galactic Center |
| DDTE | Design |
| NRO | National Reconnaissance Office |
| SLAP | Space Link Access Protocol |
| APL | Applied Physics Laboratory (at Johns Hopkins) |
| EUVE | Extreme UltraViolet Explorer |
| PPM | Positions And Proper Motions (catalog) |
| TWTA | Travelling Wave Tube Amplifier |
| TPS | Thermal Protection System |
| SAMS | Space Acceleration Measurement System |