| Acronym | Meaning |
| GSP | Geophysical Statistics Project |
| ZDR | Differential Reflectivity |
| IIWG | International Investigator Working Group |
| IFC | InFlight Black Body Calibrator |
| ATAMC | Air Transport Association Meteorological Committee |
| ORNL | Oak Ridge National Laboratory |
| R | Rayleigh |
| OSO | Orbiting Solar Observatory |
| ISRO | Indian Space Research Organization |
| MAPS | Millions Of Actions Per Second |