| Acronym | Meaning |
| HETG | High-energy Transmission Grating |
| NCWQ | National Commission On Water Quality |
| ANA | Adiabatic Nuclei Approximation (in Electron-mol. Scattering) |
| LDGUGA | Loop-driven Graphical Unitary-group Approach (in MC-SCF Calcns.) |
| ASCB | American Society For Cell Biology |
| ADP | Auger Depth Profiling |
| VOIE | Valence Orbital Ionization Energy |
| NLXC | Nonlocal Exchange Correlation (potential) |
| ASP | Antisegregation Process |
| RAO | Remedial Action Objective |