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 (company), a blockchain technology company

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 (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
• Vympel K-13, an air-to-air missile known as R-3S in Soviet service

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)
• R3 (New York City Subway car), a subway car that ran on the 16 line in the New York City subway system
• R3 (Rodalies de Catalunya), a commuter rail line in Barcelona, Catalonia, Spain

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

See also

• R03 (disambiguation)
• 3R (disambiguation)