R3
R3, R.III or R-3 or R/3 may refer to:
Aviation
    
- Aviatik R.III, a German aircraft
 - DFW R.III, a World War I German bomber aircraft
 - Ross R-3 glider
 - Tupolev R-3 Soviet reconnaissance aircraft
 - Yakutia Airlines IATA airline designator
 
Companies
    
- R3 (marketing consultants), an independent global marketing consultancy
 - R3 (R3CEV)
 
Entertainment
    
- BBC Radio 3, a radio operated by the BBC within the United Kingdom
 - R3 (TV series), produced by the BBC between 1964 and 1965
 - Region 3, the DVD region code for Southeast Asia, South Korea, Republic of China (Taiwan), Hong Kong, Macau
 - Resistance 3, the third game in the Resistance series
 - R3 (video game), a computer game for the Amiga series of computers in 1995
 
Military
    
- Version of the German Rheintochter ground to air missile
 - R-3 (missile), the Vympel K-13, an air-to-air missile also known as R-3S in Soviet service
 - R-3 (tank), a proposed Romanian tank design for use in World War II
 - USS R-3 (SS-80), a 1919 R-class coastal and harbor defense submarine of the United States Navy
 
Science
    
- R3: Extreme risk of explosion by shock, friction, fire or other sources of ignition, a risk phrase in chemistry
 - R-3 process, a chromogenic photo process for making Type R prints
 - R3 or receptor 3, the third in line of a series of cellular receptors, generally at the end of an acronym
 - R3, three-dimensional space, the Euclidean space of real numbers in three dimensions
 
Transportation
    
- R3 expressway (Czech Republic), a road connecting Kaplice and the border with Austria
 - R3 expressway (Slovakia), a road connecting Krupina and Zvolen
 - Radial Road 3 or R-3, an arterial road of Manila, Philippines
 - R-3 motorway (Spain), a road connecting Madrid and Tarancón
 - R3 (SEPTA), a former commuter rail line in and near Philadelphia, Pennsylvania, which has been split into:
- Media/Elwyn Line (R3 Media/Elwyn, formerly R3 West Chester),
 - West Trenton Line (SEPTA) (R3 West Trenton)
 
 - R3 (ring road) in Belgium
 - R3 (Rodalies de Catalunya), a commuter rail line in Barcelona, Catalonia, Spain
 - R3 Lougheed Highway, an express bus route in Metro Vancouver, British Columbia, Canada
 
Other uses
    
- Ågestaverket, also known as R3, was the third nuclear reactor built in Sweden
 - Jaguar R3, a car made by Jaguar Racing for the 2002 Formula One season
 - Leica R3, a 1976 35mm SLR camera
 - Reduce, reuse, recycle
 - SAP R/3, the previous designation for an enterprise resource planning software produced by SAP AG; the new name is SAP ERP
 - Yamaha R3
 - ISO Recommendation R3, a forerunner to the international standard ISO 3
 - Canon EOS R3, a Canon full-frame mirrorless interchangeable-lens camera
 
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