http://encyclopedia.thefreedictionary.com/AVR
Avon Valley Railway, a heritage railway in the United Kingdom
Atmel AVR, a family of microcontrollers
Assiniboine Valley Railway, a minimum gauge railway in Winnipeg, Canada
Allegheny Valley Railroad, shortline railroad in Pennsylvania, U.S.
Audio/Video Receiver
Aortic valve replacement
Automated Voice Response
Automatic Voltage Regulator
Andrew Van Ryzin
Video file used by certain set-top boxes
AVR reactor, a German prototype pebble bed reactor
Annapolis Valley Radio, a country station located in Kentville, Nova Scotia
Aboriginal Voices Radio, an Aboriginal Canadian national radio network
Automatic Vehicle Recognition