| Acronym | Meaning |
| FAO | Floating Atomic Orbital |
| IRI | International Reference Ionosphere |
| ACEEE | American Council For An Energy Efficient Economy |
| ECCI | Electron Channeling Contrast Imaging |
| ADA | Adenosine Deaminase |
| AMD | Age-related Macular Degeneration |
| MSS | Monosulfide Solid Solution |
| CARD | Caspase Recruitment Domain |
| ECRA | Economic Cleanup Responsibility Act |
| HDVV | Heisenberg-Dirac-Van Vleck (Hamiltonian Or Exchange Parameter) |