| Acronym | Meaning |
| ASI | Advanced Study Institute (NATO) |
| BTZ | Below The Treatment Zone |
| DCA | Dressed-cluster Approximation (in Band-structure Calcns.) |
| AEGL | Acute Exposure Guideline Level |
| IIRS | Ion Impact Radiation Spectroscopy |
| RAA | Rigid-atom Approxn. (in Electronic Structure Calcns.) |
| AHW | Atomic Hydrogen Welding |
| VPD | Vapor Pressure Deficit |
| FOISD | Fiber Optic Isolated Spherical Dipole Antenna |
| STA | Single-transition Approximation |