| Acronym | Meaning |
| OCCSD | Open-shell Coupled-cluster (with) Single (and) Double (excitations) |
| DAM | Military Applications Branch (French; Direction Des Applications Militaires) |
| NIHHS | Notification Of Installations Handling Hazardous Substances Regulations (UK) |
| CUS | Coordinatively Unsaturated Site |
| UTL | Upper Tolerance Limit |
| HOC | Halogenated Organic Carbons |
| FEG | Field Emission Gun |
| PCI-80 | Parametrized Configuration Interaction (with Parameter) 80 |
| MP2(FC) | MP2(frozen Core) Only (outer) Valence Electrons Included In The Approximation |
| GMCC | Geophysical Monitoring For Climate Change |