| Acronym | Meaning |
| ILS | Intracavity Laser Spectroscopy |
| PEM | Photoelectron Microscopy |
| IEC | Ion-exchange Chromatography |
| STE | Septic Tank Effluent |
| BNN | Back-propagation Neural Network |
| CAGE | Controlled Active Global Experiments |
| ESIPT | Excited-state Intramolecular Proton Transfer |
| LACO | Linearized Atomic Cell Orbital (in Energy-band Calcn.) |
| CBC | Complete Blood Count |
| PT2F | Second-order Perturbation Theory (with) Fock (matrix) |