| Acronym | Meaning |
| PTGC | Programmed-temperature Gas Chromatography |
| LD | Laser Diode |
| WSTCM | Watson-sphere Terminated Cluster Model (in Electronic-structure Calcns. On Crystal Defects) |
| PICLS | Photoionization Controlled-loss Spectroscopy |
| SCCF | Self-consistent Crystal Field (method For Calcns. On Molecular Crystals) |
| GME | Generalized Master Equation (in Quantum Statistical Mechanics) |
| BABE | Bio-Augmentation Batch Enhanced |
| HWTC | Hazardous Waste Treatment Council |
| CFO | Crystal Field Orbital |
| POY | Partially Oriented Yarn (usually Synthetics |