| Acronym | Meaning |
 | DMSP | Defense Meteorological Satellite Program |
| OTHB | Over The Horizon Backscatter |
| GSC | Guide Star Catalog |
| CZCS | Coastal Zone Color Scanner |
| THIR | Temperature/Humidity Infrared Radiometer |
| DMR | Differential Microwave Radiometer |
| HF | High Frequency |
| LY | Light Year (usu. Ly) |
| GPS | Global Positioning System |
| AIAA | American Institute Of Aeronautics And Astronautics |
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