| Acronym | Meaning |
| SZA | Solar Zenith Angle |
| ISS | Intermediate Solid Solution |
| ETD | Enhanced Trickle Down (watershed Acidification Model) |
| MAP | Magnesium Ammonium Phosphate |
| QUE | Quantized Universal Enveloping (algebras In Mol. Vibrational Spectra Calcns.) |
| CAT | Computer-aided Tomography |
| PHRED | Public Health Risk Evaluation Data |
| PDFT | Perturbation Density-functional Theory |
| NASC | North American Shale Composite |
| EBIC | Electron Beam Induced Current |