| Acronym | Meaning |
| FCC | Flat Collect Circuit (in Solar Cell Array For Spacecraft) |
| P-T-T-D | Pressure-temperature-time-deformation Path (for Metamorphic Rocks) |
| RITS | Radiatively Important Trace Species |
| TVA | Tennessee Valley Authority |
| HRGS | High-resolution Gamma-ray Spectrometry |
| GRPA | Generalized Random-phase Approximation |
| CHEMICS | Combined Handling Of Elucidation Methods For Interpretable Chemical Structures |
| SPV | Surface Photovoltage |
| MON | Motor (method) Octane No. |
| GWDR | Ground Water Disinfection Rule |