| Acronym | Meaning |
 | C | Centigrade |
| SSU | Stratospheric Sounding Unit (TOVS) |
| FSL | Forecast Systems Laboratory (a NOAA ERL) |
| AC | Alternating Current |
| PIFTS | Planetary Imaging Fourier Transform Spectrometer |
| HSB | Humidity Sounder For Brazil |
| NPOESS | National Polar-orbiting Operational Environmental Satellite System |
| HIRDLS | HIgh-Resolution Dynamics Limb Sounder (EOS) |
| AMSU | Advanced Microwave Sounder Unit (EOS) |
| SSEC | Space Science And Engineering Center |
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