| Acronym | Meaning |
| REMPI | Resonance-Enhanced Multiphoton Ionization (for Mass Spectrometry) |
| PROC | Photochemically Reactive Organic Compound(s) |
| NLET | National Laboratory For Environmental Testing |
| CDAF | Continuous Distributed Approximating Function |
| BTIS | Beam Tube Isolation System |
| EEM | Episodic Event Model (of Acidification) |
| SS-MR-CC | State-selective Multireference Coupled-cluster |
| USP | United States Pharmacopeia |
| IRR | Internal Rate Of Return |
| VGO | Vacuum Gas Oil |