| Acronym | Meaning |
| BIR | Baculovirus IAP Repeat |
| HAO | Hybrid Atomic Orbital |
| PBL | Planet Boundary Layer (in Atmospheric Chemistry And Physics) |
| UW-PG | Uniformly Weighted Planar Grid (method In Calcns. Of Electron-momentum Distributions) |
| MACHO | Massive Compact Halo Object |
| VDZ | Valence Double Zeta |
| GWPS | Groundwater Protection Strategy |
| NSE | Neutron Spin Echo |
| EBSP | Electron Backscattering Pattern |
| PNO | Pseudonatural Orbital |