| Acronym | Meaning |
| CASTNET | Clean Air Status And Trends Network |
| IRGCHAZ | Intercritically Reheated Grain-coarsened Heat-affected Zone |
| IEM | Interstitial Electron Model |
| DSTD | Dynamic Surface Tension Detection |
| ASTHO | Association Of State And Territorial Health Officers |
| LACBED | Large-angle Convergent-beam Electron Diffraction |
| IBS | Ion Backscattering Spectroscopy |
| QITMS | Quadrupole Ion Trap Mass Spectrometry |
| MPW | Multiple Plane Wave (in Electronic-property For Metals) |
| IRGL | Interagency Regulatory Liaison Group |