| Acronym | Meaning |
| IMOA | Iterative Maximum Overlap Approximation |
| ISDN | Isosorbide Dinitrate |
| UFC | Uniform Fire Code |
| PTM | Posttranslational Modification |
| FSR | Fixed Salt Recovery (in Regeneration Of Blowdown From HCN Scrubber) |
| ALA | American Library Association |
| HSF | Hiller-Sucher-Feinberg (equation For Calcn. Of Spin Densities And Charge Densities In Mols.) |
| HRV | Human Rotavirus |
| MBBR | Moving Bed Biofilm Reactor |
| IRAS | Infrared Astronomy Satellite |