| Acronym | Meaning |
| NOM | Natural Organic Matter |
| HORSES | Higher-order Raman Spectral Excitation Studies |
| FOTOS | First-order Theory Of Oscillator Strength |
| RSMP | Rayleigh-Schroedinger-Moeller-Plesset Perturbation |
| CVM | Cluster Variation Method (in Calcns. On Semiconductors) |
| BRS | Bibliographic Retrieval System |
| PDR | Photodissociation Region |
| RMSEP | Root-mean-square Error Of Prediction |
| HIT | Heterojunction With Intrinsic Thin Layer (photovoltaic Cell; Solar Cell) |
| TEEL | Temporary Emergency Exposure Limit |