| Acronym | Meaning |
| HTLA | Heat-treatable Low Alloy (steel) |
| ACC | American Chemistry Council |
| MBPT(2)-GF | Second-order Many-body Perturbation Theory-green Function |
| UMNDO | Spin-unrestricted Modified Neglect Of Diatomic Overlap |
| TOF | Turnover Frequency |
| CMC-SCF | Complete Multiconfiguration Self-consistent Field |
| CAI | Conodont Alteration Index |
| MOVB | MO-valence Bond |
| IDI | Ion Dipole Induced (potential Term In Potential Energy Surfaces) See Also LEPS-IDI |
| GGWD | Generalized Gaussian Wave-packet |