| Acronym | Meaning |
| GEM | Gas Electron Multiplier |
| M/Z | Mass-to-charge Ratio |
| AMWA | American Metropolitan Water Association |
| PYS | Partial Yield Spectroscopy |
| NLAP | Nonlimited Aeration Process (for Waste Treatment) |
| SEL | Stacked Elemental Layer (vapor Deposition Technique) |
| TEEL | Temporary Emergency Exposure Limit |
| COSCI | Complete Open Shell Configuration Interaction |
| ICT | Intramol. Charge Transfer |
| AEP | Auditory Evoked Potential |