| Acronym | Meaning |
| EM | Electronic Mail |
| RA# | Raleigh Number |
| ISA | Instrument Society Of America |
| DEWS | Doppler Electronic Weather Sensor |
| IDB | Immediate Direct Broadcast |
| EPI | Environmental Policy Institute |
| ITM | Ionosphere-Thermosphere-Mesosphere |
| OA | Office Automation |
| OMDR | Optical Memory Disk Recorder |
| TUTT | Tropical Upper-tropospheric Trough |