| Acronym | Meaning |
| OBS-MCSC | Optimized Basis Set-multiconfiguration Spin Coupled |
| HESS | High Energy Stereoscopic System |
| GRVB | Generalized Resonating Valence Bond |
| ERPA | Extended Random Phase Approximation |
| AS | Absorption Spectroscopy |
| MSM | Multishell Method |
| NC-IUBMB | Nomenclature Committee Of The International Union Of Biochemistry And Molecular Biology |
| RCCSD | (partially) Restricted CCSD |
| NESCAUM | North East States Coalition For Air Use Management |
| LUMO | Lowest Unoccupied Molecular Orbital |