| Acronym | Meaning |
 | SSEC | Space Science And Engineering Center |
| ATOVS | Advanced TIROS Operational Vertical Sounder |
| FTS | Fourier Transform Spectrometer (HIS |
| OSSE | Office Of Space Science Education (SSEC) |
| ESOC | European Satellite Operations Center |
| IRIS | Infrared Radiation Interferometer Spectrometer (1960s) |
| M | Meter(s) |
| K | Kilo |
| ABS | Advanced Baseline Sounder |
| DXS | Diffuse X-ray Spectrometer |
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