| Acronym | Meaning |
| ULF | Ultra Low Frequency |
| QSBR | Quant. Structure-biodegrdn. Relationships |
| ASE | Augmented Secular Equation |
| HIAA | Hydroxyindoleacetic Acid |
| P-T-T-D | Pressure-temperature-time-deformation Path (for Metamorphic Rocks) |
| IAC | Impregnated Activated Carbon |
| DWX | Distorted-wave Approxn. With Exchange |
| WDA | Weighted-density Approxn. (within D. Functional Formalism) |
| LOF | Lack Of Fit |
| R-GVB | Resonating-generalized Valence Bond (wave Function) |