| Acronym | Meaning |
| CC-VTZ | Correlation Consistent-valence Triple Zeta (basis Set) |
| ATPASE | Adenosine Triphosphatase |
| ACC | Approximate Coupled Cluster |
| MCRHF | Multiconfigurational Relativistic Hartree-Fock |
| ACNK | Al2O3/(CaO + Na2O + K2O) |
| L2 | Square Integrable (wave Function) (in Electron-atom Or -mol. Collisions) |
| BSA | Breathing-sphere Approxn. (for Inelastic Mol. Collisions) |
| CEA | Carcinoembryonic Antigen |
| PTI | Positive Thermal Ionization (for Mass Spectrometry) |
| HEM | Human Exposure Model |