| Acronym | Meaning |
| ELLPAT | Environmental Lead Laboratory Proficiency Analytical Testing |
| LSR | Lanthanide Shift Reagent |
| ERFEN | Estudio Regional Del Fenomeno El Nino |
| STORET | Storage And Retrieval Of U.S. Waterways Parametric Data |
| DDRPA | Double Direct Random Phase Approximation |
| BEI | Backscattered Electron Imaging |
| CAOPM | Configuration-averaged Optimized-potential Model |
| TCR | Temperature Coefficient Of Resistance |
| HAO | Hydrogenic Atomic Orbital |
| CEPPO | Chemical Emergency Preparedness And Prevention Office |