| Acronym | Meaning |
| RIR | Reference-intensity Ratio |
| GRM | Geopotential Research Mission (USA Satellite) |
| QPEN | Quantum-mech. Potential (based On Interactios Of) Electrons (and) Nuclei |
| BPDA | Born Point Dipole Approximation |
| DEXAFS | Dispersive Extended X-ray Absorption Fine Structure |
| APIMS | Atmospheric Pressure Ionization Mass Spectrometry |
| SCS | Soil Conservation Service |
| PPI | Proton Pump Inhibitor |
| HSC | Hepatic Stellate Cells |
| LCOAO | Linear Combination Of Orthogonal Atomic Orbitals |