| Acronym | Meaning |
 | STS | Space Transportation System |
| NAPRI | North American Pollutant Release Inventory |
| DO | Dissolved Oxygen |
| PET | Petrol. Elementary Tools (computer Program) |
| OSCCM | Open-shell Coupled-cluster Method (in Electronic Property Calcn.) |
| ISX | Insoluble Starch Xanthate (ion Exchanger For Wastewater Treatment) |
| FPT | Finite Perturbation Theory |
| MOCETGAO | Molecule-optimized Contracted Even-tempered Gaussian Atomic Orbital |
| PPM | Parts Per Million |
| PWFB | Plane-wave First Born |
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