| Acronym | Meaning |
| HSX | Helically Symmetric Experiment |
| APSG | Antisymmetrized Product Of Separated Geminals |
| ILWAS | Integrated Lake Water Acidification Study |
| URF | Unit Risk Factor |
| BCA | Binary-collision Approximation |
| MP2(FU) | MP2(full) Inner-core Electrons Are Included In The Approxn. |
| TSLLE | Thermospray Liquid-liquid Extraction |
| TOTE | Tropical Ozone Transport Experiment |
| MSD | Mean Square Displacement |
| LMO | Localized Molecular Spin Orbital |