| Acronym | Meaning |
| ISSC | International Subcommission On Stratigraphic Classification |
| XFH | X-ray Fluorescence Holography |
| GAIM | Global Analysis Interpretation And Modeling |
| SUPERDARN | Super Dual Auroral Radar Network |
| AEHS | Association For The Environmental Health Of Soils |
| DF-OCE | Dirac-Fock One-center Expansion |
| GM | Geometric Mean |
| FEMA | Flavor Extract Manufacturers Association |
| LBO | Localized Born-Oppenheimer |
| SIP | State Implementation Plan |