| Acronym | Meaning |
| SIAM | Society For Industrial And Applied Mathematics |
| SEPT | Secular Equation (with) Perturbation Theory |
| NMMAPS II | The National Morbidity |
| MIRO | Mineral Industry Research Organization (UK) |
| EHMI | Environmental Hazards Management Institute |
| PCI | Perturbative Configuration Interaction |
| NEXAFS | Near-edge X-ray Absorption Fine Structure |
| WCRP | World Climate Research Programme |
| SEL | Stacked Elemental Layer (vapor Deposition Technique) |
| IIW | International Institute Of Welding |