| Acronym | Meaning |
 | PIRI | Photoinduced Rydberg Ionization |
| NHRL | Northern Hemisphere Reference Line |
| VSEPR | Valence-shell Electron-pair Repulsion |
| ICMA | Immunochemiluminometric Assay |
| UASB | Upflow Anaerobic Sludge Blanket |
| ATOFMS | Aerosol Time-of-flight Mass Spectrometry |
| NAWDEX | National Water Data Exchange |
| ARISE | Advanced Radio Interferometry Between Space And Earth |
| UTP | Unitary Transformation (based) Perturbation (theory) |
| GDR | Geophysical Data Record |
Browse by Letter:
