| Acronym | Meaning |
| FSR | Free Spectral Range |
| NDO | Neglect Of Differential Overlap |
| MEDLA | Molecular Electron Density Lego Assembler |
| MOM | Maximum Overlap Method |
| MAMU | Mobile (ambient) Air Monitoring Unit (Canada) |
| IRLG | Interagency Regulatory Liaison Group |
| VREF | Vancomycin-resistant Enterococcus Faecium |
| FRAM | Ferroelectric Random Access Memory |
| HFF | Hellmann-Feynman Force Approximation |
| SNS | Separation Network Synthesis (chemical Engineering Design) |