| Acronym | Definition |
|---|
| URIs➣upper respiratory tract infections |
| URIs➣Underwater Robotic Intelligent System (marine technology) |
| URIs➣Unions Régionales des Ingénieurs et Scientifiques (French: Regional Union of Engineers and Scientists) |
| URIs➣Umwelt Rechts Informations System (German: Environmental Law Information System; database) |