| Acronym | Meaning |
| DDQRPA | Double Direct Quadratic Random Phase Approximation |
| LEERM | Low Energy Electron Reflection Microscopy |
| MIDAS | Manchester Information Datasets And Associated Services |
| VTE | Vertival Tube Exchanger |
| MSL | Mean Sea Level |
| STAPPA | State And Territorial Air Pollution Program Administrators |
| HEIS | High Energy Ion Scattering |
| HMPGI | Hybrid Multiple-prism Grazing-incidence |
| MCE | Microchannel Epitaxy |
| PTA | Plasma Transferred Arc |