| Acronym | Meaning |
| XGRS | X-ray/gamma-ray Spectrometer |
| NIRF | Near-infrared Fluorescence |
| ADPI | Air Diffuser Performance Index |
| OPM | Optimized Potential Model |
| GLAS | Geoscience Laser Altimeter System |
| APT | Accelerator Production Of Tritium |
| FNA | Fine-needle Aspiration |
| GEMS | General Energy And Material Balance System [model] |
| CCDW | Commensurate Charge-density Wave |
| G1 | Gaussian-one (theory For Calcg. Mol. Energies) |