| Acronym | Definition |
|---|
| RIRS➣Rhode Island Rose Society |
| RIRS➣Regulatory Information Retrieval System (National Association of Insurance Commissioners) |
| RIRS➣Retrograde Intrarenal Stone Surgery (treatment of kidney stones) |
| RIRS➣Railroad Inspection Reporting System |
| RIRS➣Random Insertion of Redundant Symbols |