ARR
ARR is an abbreviation for:
- Absolute risk reduction, degree of therapy effectiveness, see Relative and absolute risk reduction
- Adolf Reichwein Secondary School (Witten)
- Agencja Rynku Rolnego , Polish Agricultural Market Agency
- Air Armenia , an Armenian airline (ICAO code)
- Alaska Railroad , American railroad company
- All Real Records, German hip-hop record label, see Curse
- Andøya Rakettskytefelt , a rocket launch site on the Norwegian island of Andøya
- Amoroso-Robinson relation , a certain transformation of the marginal revenue function in microeconomics
AR-R stands for:
- Río Negro Province , Argentina (country code according to ISO 3166-2)
arr. in music stands for:
- arranged, see arrangement
