| Acronym | Meaning |
| SI | State Interaction Method |
| REMPI | Resonance-Enhanced Multiphoton Ionization (for Mass Spectrometry) |
| CCI | Crevice Corrosion Index |
| GDAAS | Glow Discharge Atomic Absorption Spectrometry |
| ICRMS | International Chemical Regulatory Monitoring System |
| T-GAS | Trace Gas Accounting System |
| FUMI | Function Of Mutual Information |
| ASP | Activated Sludge Plant Or Process |
| ESE | Extended-surface Electrolysis |
| ULEV | Ultra Low Emission Vehicle |