| Acronym | Meaning |
 | AAR | Association Of American Railroads |
| RPI | Radius Polydispersity Index |
| IGCI | Industrial Gas Cleaning Institute |
| EX-MEG | Excited-mixed Exponentially Generated (wave Function) |
| ATEM | Analytical Transmission Electron Microscopy |
| MCOPM | Multiconfiguration Optimized Potential Model |
| MHEMT | Metamorphic High Electron Mobility Transistor |
| FGD | Flue Gas Desulfurization |
| LET | Light-emitting Transistor |
| NAAQS | National Ambient Air Quality Standards |
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