| Acronym | Meaning |
| TBM | Thyssen Blowing Metallurgy |
| RVDT | Rotary Variable Differential Transformer |
| LCMO | Linear Combination Of Molecular Orbitals |
| EGFR | Epidermal Growth Factor Receptor |
| EFRTS | External-floating-roof Tanks |
| CMAS | CaO-MgO-aluminum Oxide-silicon Dioxide |
| THCP | Total Hazard Control Plan |
| CSA | Coupled States Approxn. |
| ICF-CI | Interacting Correlated Fragment-CI (wave Function) (see Also SA-MCSCF) |
| SCOT | Shell Claus Off-gas Treating |