| Acronym | Meaning |
| NESDD | NOAA Earth Science Data Directory |
| CDOS | Customer Data And Operations System |
| HF | High Frequency |
| PDM | Pulse Duration Modulation |
| ARRL | Amateur Radio Relay League |
| ITWS | Integrated Terminal Weather System |
| CASAC | Clean Air Scientific Advisory Committee |
| LM | Large Model |
| UGGI | See IUGG |
| MFEM | Magnetic Field Explorer Mission |