| Acronym | Meaning |
| AVS | Acid Volatile Sulfide |
| HGCU | Hot-gas Particulate Cleanup |
| OMHCE | Organic Material Hydrocarbon Equivalent |
| PED | Potential Energy Distribution |
| SSM | Synthetic Soil Matrix (US EPA) |
| RHFR | Relativistic Hartree-Fock-Roothaan |
| LOI | Loss On Ignition |
| RIP | Ribosome-inactivating Protein |
| MWIR | Medium Wavelength IR |
| FCM | Finite-cluster Model (for Calcns. On Electromigration) |