1. = Socially Responsible Investing
2. = Stanford Research Institute (now called SRI International)
3. = Silsoe Research Institute (UK)
4. = Southwest Research Institute (San Antonio, Texas)
5. = Scripps Research Institute
6. = Southern Research Institute (University of Alabama at Birmingham)
7. = Sunnybrook Research Institute (Sunnybrook Health Sciences Centre, Toronto, ON, Canada)
8. = Scientific Research Institute (Menlo Park, CA)
9. = Space Research Institute
10. = Serotonin Reuptake Inhibitor
11. = Siena Research Institute
12. = Swiss Radio International
13. = Supplier Registration Information
14. = Steel Recycling Institute
15. = Solar Reflectance Index
16. = Serviciul Roman de Informatii (Romanian Intelligence Service)
17. = Send Routing Information (cellular)