| Acronym | Meaning |
| HFA | Humic And Fulvic Acids |
| OGC | Office Of General Counsel |
| GBH | Gravel Bed Hydroponic System (for Wastewater Treatment) |
| FNOC | Fleet Numerical Oceanography Center (USA Navy) |
| STHF | Single-term Hartree-Fock |
| LOI | Loss On Ignition |
| NCS | Notification Of Compliance Status |
| OP-AMP | Operational Amplifier |
| LPME | Liquid-phase Microextraction |
| RLF | Radially Localized (wave) Function |