| Acronym | Meaning |
| VSMOW | Vienna Standard Mean Ocean Water |
| PSCF | Potential Source Contribution Function |
| CC-EH | Coupled-cluster Effective Hamiltonian |
| BAT | Brown Adipose Tissue |
| HRC | Rockwell Hardness (C Scale) |
| ERIS | Electrochemically Regenerated Ion Suppressors |
| HI | Hinkley Index |
| 2PH TDA | Two-particle-hole Tamm-Dancoff Approximation (for Closed-shell |
| AAM | Automated Auger Microprobe |
| ND | Nitrification Denitrification |