| Acronym | Definition |
|---|
| IRSB➣Intravenous Regional Sympathetic Block |
| IRSB➣Italian Rolling Street Battle (Milan, Italy) |
| IRSB➣Immunization Registry Support Branch (National Immunization Program; US CDC) |
| IRSB➣Incident Response to Suicide Bombing |
| IRSB➣Interim Retention Storage Basins |
| IRSB➣Intraline Resources Sdn. Bhd. (Malaysia) |