| Acronym | Meaning |
| CPSS | Chemist's Personal Software Series |
| IAP | Imaging Atom Probe |
| VCI | Valence Configuration Interaction (wave Function) |
| ELSA | Emergency Level Scale Assessment |
| KT | Koopmans Theorem |
| LBD | Ligand Binding Domain |
| NNSA | National Nuclear Security Administration |
| TSDW | Torsional Spin Density Wave |
| MSAPC | Mobile Source Air Pollution Control |
| GCLSDA | Gradient-corrected Local Spin Density Approximation |