| Acronym | Meaning |
| MHZ | Megahertz |
| WBRT | Weather Bureau Radio Thoedolite |
| MDM | Multiplexer/demultiplexer |
| EGD | Effluent Guidelines Division |
| HMMR | High Resolution Multifrequency Microwave Radiometer |
| MODE | MODE In Cospar Papers |
| CASE | Computer Aided Software Engineering |
| GEOS | Geostationary Earth-Orbiting Satellite |
| IRMS | Isotope Ratio Mass Spectrometer |
| SI | Systeme International |