| Acronym | Meaning |
| UFFI | Urea-formaldehyde Foam Insulation |
| APF | Advanced Particle Filter |
| UEGO | Universal Exhaust Gas Oxygen Sensor |
| TDTF | Time-dependent Thomas-Fermi |
| VGAAS | Vapor Generation Atomic Absorption Spectrometry |
| GIMS | Grazing Incidence Moessbauer Spectroscopy |
| ACS | Adiabatically Corrected Sudden |
| QC-SCF | Quadratically Convergent SCF (for Closed-shell Systems) |
| HWI | Hazardous Waste Incineration |
| CSN-ICP | Conductive Solids Nebulizer-inductively Coupled Plasma |