| Acronym | Meaning |
| PSL | Polystyrene Latex |
| AQS | Air Quality Standard |
| APL | Alternative Pollutant Limits |
| GDIM | Generalized Diatomics-in-molecules (theory) |
| ITC | International Translation Center |
| WSOC | Water-soluble Organic Carbon |
| PASADENA | Para-hydrogen And Synthesis Allow Dramatically Enhanced Nuclear Alignment |
| USANS | Ultra-small-angle Neutron Scattering |
| LACO | Linearized Atomic Cell Orbital (in Energy-band Calcn.) |
| GM | Geometric Mean |