Acronyms
- Office of Rail Regulation, UK government agency
- Office of Refugee Resettlement, part of the United States Administration for Children and Families
- Offshore Racing Rules, system to permit different sailboats racing against each other
- Oxygen reduction reaction, a type of chemical reaction
- Outer Ring Road (disambiguation), a series of Roads in various places around the world
- Outer Ring Road, Bangalore
- Outer Ring Road, Chennai
- Outer Ring Road, Delhi
- Outer Ring Road, Hyderabad
- ORR, overall response rate or objective response rate, one of the parameters determined during Clinical trials for pharmaceutical products
Read more about this topic: Orr