| Acronym | Meaning |
| HT-EOVC | High-temperature Engine Oil Viscosity Classification |
| TLP | Transient Liquid Phase |
| CCBA | Coupled-channel Born Approximation |
| ESIX | Electrically Switched Ion Exchange |
| EBOM | Effective Bond-orbital Method |
| SPUMPN | Single-annihilation Procedure Unrestricted Moeller-Plesset Nth-order |
| IP | Impact Parameter Approximation |
| HPPM | Hole-particle Potential Model (in Mol. Excited States Calcns.) |
| ACEMS | Angular Conversion Electron Moessbauer Spectroscopy |
| FTHF | Finite-temperature Hartree-Fock |