| Acronym | Meaning |
| VIVAH | Vibrational Variational Hyperspherical (for Mol. Calcns.) |
| PQL | Practical Quantitation Levels (of Pollutants |
| CASTNET | Clean Air Status And Trends Network |
| COP | Crystal Originated Particle |
| HTU | Height Of Transfer Unit (in Packed Tower Aeration System) |
| MIES | Maximum Ionicity Excited State (model In Energy Calcn. Of Mols.) |
| IRMP | International Remote Monitoring Program |
| HGAFS | Hydride Generation Atomic Fluorescence Spectrometry |
| PVM | Photovoltaic Power Module |
| PERC | Passivated Emitter And Rear Cell (solar Cells) |