| Acronym | Definition |
|---|
| TIRS➣The Integrated Reasoning Shell (IBM) |
| TIRS➣Transport Infrastructure Regional Study (Europe) |
| TIRS➣Tactical Interrogation Report |
| TIRS➣Thermal Infrared Scanner |
| TIRS➣Temple Israel Religious School (various locations) |
| TIRS➣TL1 Interface Router Service (Nortel) |
| TIRS➣Tactical Information Retrieval System |
| TIRS➣Telephone Investigator's Research System |