ARR or Arr may refer to: People Jonny Arr (born 1988), English rugby union player A. R. Rahman (born 1967), Indian film composer, record producer, musician and singer Places Arr, Mauritania, a town Science and technology Absolute risk reduction, a statistical term used in biostatistics and epidemiology Address-range register, in computer hardware Aldosterone-to-renin ratio, a hormone/enzyme blood concentration Application Request Routing, a proxy-based routing module for Internet Information Services, a Windows-based web server Transportation Air Armenia, ICAO airline code ARR Alaska Railroad, reporting mark ARR Alberta Resources Railway Arram railway station, England, National Rail code ARR Aurora Municipal Airport (Illinois), FAA airport code ARR Alto Río Senguer Airport, Argentina, IATA code ARR Other uses "Arr!", a phrase used by pirates in popular culture Average Run Rate method, in cricket Accounting rate of return, a financial ratio Aeronautica Regala Romana, or Royal Romanian Air Force Ramarama language, ISO 639-3 code arr Artist's resale right or droit de suite, royalties to the original artist upon resale Annual Recurring Revenue is a type of revenue stream All rights reserved Arranged by See also