| Acronym | Meaning |
| AWM | Average Wave Function Method (in Calcns. On Scattering) |
| NDA | Nondestructive Assay |
| WHSV | Wt. Hourly Space Velocity |
| FIMS | Field Ionization Mass Spectrometry |
| CBEC | Concentration-based Exemption Criteria |
| SOMO | Semioccupied Molecular Orbital |
| LDRP | Leak Detection And Repair Program |
| DGB | Distributed Gaussian Basis (mol. Wave Function) |
| NRA | National Rivers Authority (UK) |
| SPI | Society For The Plastics Industry |