| Acronym | Meaning |
 | ATM | Analytic Tetrahedron Method (for Brillouin-zone Integrals And Electron Spin Densities) |
| NPOX | Nonpurgeable Organic Halide |
| ISMAR | International Society Of Magnetic Resonance |
| HWRA | Hazardous Waste Reduction Act |
| PYMS | Pyrolysis Mass Spectrometry |
| MDI | Methylene Di-p-phenylene Isocyanate |
| SOM | Soil Organic Matter |
| AASHO | American Association Of State Highway Officials |
| FSGF | FREEON Symmetric Group Formulation (of Hartree-Fock Theory) |
| APPI | Atmospheric Pressure Photoionization |
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