ARR
People
- Johnny Arr, an English rugby union player
- A. R. Rahman, Indian film composer, record producer, musician and singer
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 blood concentration
- Application Recovery and Restart, in Windows Vista and later
Transportation
- Air Armenia, by ICAO airline code
- Alaska Railroad, by reporting mark
- Alberta Resources Railway
- Arram railway station, United Kingdom, by National Rail code
- Aurora Municipal Airport (Illinois), by ICAO and FAA airport code
Other
- All rights reserved, in copyright law
- Accounting rate of return, a financial ratio
See also
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