| Acronym | Meaning |
| ECCS | Emergency Core Cooling System |
| IVR | Intramolecular Vibrational Energy Redistribution |
| CVM-CI | Constrained Variational Method-CI |
| IIW | International Institute Of Welding |
| EGRET | Energetic Gamma Ray Experiment Telescope |
| PPE | Porcine Pancreatic Elastase |
| CTCMS | Center For Theoretical And Computational Materials Science |
| ROD | Record Of Decision |
| UMNDO | Spin-unrestricted Modified Neglect Of Diatomic Overlap |
| CDBF | Chlorinated Dibenzofurans |