| Acronym | Meaning |
| IWEM | Institution Of Water And Environmental Management |
| BATS | Biosphere-Atmosphere Transfer Scheme |
| DRPA | Direct Random Phase Approximation |
| PO | Polarization Orbital |
| CVTST | Canonical Variational Transition-state Theory |
| EMS | Environmental Management System |
| IAMAS | International Association Of Meteorological And Atmospheric Sciences |
| NNSA | National Nuclear Security Administration |
| IIW | International Institute Of Welding |
| GCM | Global Climate Model |