| Acronym | Meaning |
| ITS | Interferometer Thermal Sounder (HIS) |
| ECMWF | European Centre For Medium-range Weather Forecasts |
| HIMSS | HIgh-resolution Microwave Spectrometer Sounder |
| EOS | Earth Observing System |
| HRIR | High Resolution Infrared Radiometer |
| DCS | Data Collection System (NOAA Polar Orbiting Satellites) |
| GEWEX | Global Energy And Water Cycle EXperiment (WCRP) |
| AU | Astronomical Unit |
| ESSP | Earth System Science Pathfinder Mission (ESSP) |
| AURA | Association Of Universities For Research In Astronomy |