| Acronym | Meaning |
| OCPSF | Organic Chemical, Plastics, And Synthetic Fiber Industry |
| OHFS | Optimized Hartree-Fock-Slater |
| HC | Hazardous Constituent |
| ECPA | European Crop Protection Association |
| STS | Slater Transition State (for Calcg. Electronic Transitions Of Atoms And Molecules) |
| HSDI | High-speed Direct Injection (of Diesel Engines) |
| ISSN | International Standard Serial Number |
| ISAST | Irreversible Sorption Affected Solute Transport [model] |
| SOUR | Specific Oxygen Uptake Rate |
| PZC | Polyzirconium Compound (isopropyl Alc.-zirconium Chloride Copolymer) |