| Acronym | Meaning |
| SSER | Spinless Salpeter Equation (with) Retardation |
| XFH | X-ray Fluorescence Holography |
| HSI | Hyperthermal Surface Ionization |
| DDF | Depth Distribution Function |
| GRVB | Generalized Resonating Valence Bond |
| WWM | Wigner-Weyl-Moyal (formalism In Quantum Mechanics) |
| RICM | Reflection Interference Contrast Microscopy |
| BOM | Bond Orbital Model |
| DON | Dissolved Organic Nitrogen |
| MTES | Metastable Transfer Emission Spectroscopy |