| Acronym | Meaning |
| ISZ | Iskusstvenniy Sputnik Zemli |
| HCI | Highes Communications |
| GSO | GeoSynchronous Earth Orbit |
| NASDA | NAtional Space Development Agency |
| VHF | Very High Frequency |
| EGRET | Energetic Gamma Ray Experiment Telescope |
| AGN | Active Galactic Nucleus |
| SOFI | Spray-on Foam Insulation |
| APL | Applied Physics Laboratory (at Johns Hopkins) |
| VLBI | Very Long Baseline Interferometry |