| Acronym | Meaning |
| IES | Internal Eliminated Sequence |
| COHSEX | Coulomb-hole (plus) Screened-exchange (approxn. In Band-structure Calcns.) |
| FEI | Fire And Explosion Index |
| POC | Product Of Combustion |
| SPRKKR | Spin-polarized Relativistic Korringa-Kohn-Rostoker |
| LOI | Loss On Ignition |
| ECETOC | European Center For Ecotoxicology And Toxicology Of Chemicals |
| CNDO/S | Complete Neglect Of Differential Overlap/spectroscopic |
| PRIMA | Pattern Recognition By Independent Multicategory Analysis |
| PAPS | Phase-alternated Pulse Sequence |