| Acronym | Meaning |
| PGDN | Propylene Glycol Dinitrate |
| PNA | Peptide Nucleic Acid |
| ETBM | Empirical Tight-binding Method (in Electronic Structure Calcn.) |
| HT | Herzberg-Teller (wave Functions) |
| QAMB | Quality Assurance Materials Bank (USEPA) |
| SECH | Screened Exchange Plus Coulomb Hole Method |
| CO | Crystal Orbital |
| CSF | Carcinogenic Slope Factor |
| PBDF | Polybrominated Dibenzofuran(s) |
| PET | Potential Evapotranspiration |