| Acronym | Meaning |
 | PNDO | Partial Neglect Of Differential Overlap |
| ECNICI | Electron Capture Negative Ion Chemical Ionization |
| IDCNS | Interdivisional Committee On Nomenclature And Symbols |
| GGWD | Generalized Gaussian Wave-packet |
| TRI | Toxic Release Inventory |
| IEA | Industrial Environmental Association |
| TEC | Teo Electron Counting Method (for Complexes |
| NWEA | National Wood Energy Association |
| CIRAC | Canadian Institute For Research In Atmospheric Chemistry |
| IUPPA | The International Union Of Air Pollution Prevention Associations |
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