| Acronym | Meaning |
| GCLSDA | Gradient-corrected Local Spin Density Approximation |
| PICI | Positive-ion Chemical Ionization |
| ICDD | International Center For Diffraction Data |
| DOT | Department Of Transportation |
| CWT | Centralized Waste Treatment |
| PSL | Polystyrene Latex |
| GH | Growth Hormone |
| UNAMAP | Users' Network For Applied Modeling Of Air Pollution |
| EXES | Electron-induced X-ray Emission Spectrometry |
| RSS | Recombination Signal Sequence |