| Acronym | Meaning |
| RBF | Renal Blood Flow |
| AQCR | Air Quality Control Region (US EPA) |
| WWAP | World Water Assessment Programme |
| HMO | Hueckel Molecular Orbital |
| HKS | Hohenberg-Kohn-Sham (quantum Theory) |
| EDWBA | Exponential Distorted Wave Born Approximation |
| MHW MO | Mulliken-Helmholz-Wolfsberg Molecular Orbital |
| GEA | Gradient-expansion Approxn. (in Exchange-energy Calcns.) |
| STEAMER | Slow Turning Echo Amplitude Modulation And Echo Reduction |
| ABR | Auditory Brainstem Response |