| Acronym | Meaning |
| ASDWA | Association Of State Drinking Water Administrators |
| BGE | Background Electrolyte |
| USGS | United States Geological Survey |
| TED | Transmission Electron Diffraction |
| SWTR | Surface Water Treatment Rule |
| APP | Amyloid Precursor Protein |
| GHL | Generalized Heitler-London |
| RLV | Reusable Launch Vehicles (aeronautics) |
| PAO | Pseudo-atomic Orbital |
| PSRP | Process To Significantly Reduce Pathogens (of EPA) |