| Acronym | Meaning |
| WEEL | Workplace Environmental Exposure Limits |
| GTF | Gaussian-type (wave) Function |
| GBH | Gravel Bed Hydroponic System (for Wastewater Treatment) |
| DZPP | Double-zeta (doubly) Polarized (basis Set) |
| PEFR | Peak Expiratory Flow Rate (lung Function) |
| GFCS | Gas Filter Correlation Spectroscopy |
| MOMO | Maximum Overlap Molecular Orbital |
| NIST | National Institute Of Standards And Technology (formerly NBS) |
| NSH | Normalized Spherical Harmonic (hamiltonian) |
| CNDO SP | Complete Neglect Of Differential Overlap Spin Polarization |