| Acronym | Meaning |
 | TAC | Toxic Air Contaminant |
| ARCS | Alternative Remedial Contracting Strategy (US EPA) |
| RFA | Regulatory Flexibility Analysis |
| STS | Space Transportation System |
| CRRES | Combined Release And Radiation Effects Satellite |
| BRNO | Best Radial Natural Orbital |
| LCCW | Linear Combination Of Configurational Wave Functions |
| VPAM | Variable Phase Amplitude Method (for Electron-atom Scattering) |
| ELF | Electron Localization Function |
| AREP | Averaged Relativistic Effective Potential |
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