| Acronym | Meaning |
| DWIOS | Distorted Wave Infinite Order Sudden Approximation |
| LDGUGA | Loop-driven Graphical Unitary-group Approach (in MC-SCF Calcns.) |
| GCTE | Global Change And Terrestrial Ecosystems |
| NDIR | Nondispersive Infrared Analysis |
| LCGO | Linear Combination Of Gaussian Orbitals |
| IAHR | International Association For Hydraulic Research |
| IAQINFO | Indoor Air Quality Information Clearinghouse |
| ECP | Exchange Coupled Pair |
| PREEN | Pacific Rim Energy And Environment Network |
| ICCP | International Committee For Coal Petrology |