| Acronym | Meaning |
 | ECS-EP | Energy-corrected Sudden-exponential Polynomial (scaling Law) |
| PPE | Porcine Pancreatic Elastase |
| GEWEX | Global Energy And Water Cycle Experiment |
| PPG | Pike's Peak Granite (USGS Rock Standard) |
| ISTP | International Solar Terrestrial Physics |
| CASTNET | Clean Air Status And Trends Network |
| EEDF | Electron Energy Distribution Function |
| IFA | Immunofluorescence Assay |
| VEH | Valence Effective Hamiltonian Method (for Electronic Structure) |
| ADP | Adenosine Diphosphate (RN 58-64-0) |
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