R2, R02, R.II, R.2 or R-2 may refer to:

Entertainment

  • R2 (Rock'n'Reel), a British music magazine
  • R2-D2, a character from Star Wars films and books, nickname R2
  • Code Geass: Lelouch of the Rebellion R2, a 2008 anime series
  • Resistance 2, a video game
  • Relapse 2, a 2009 album by rapper Eminem
  • Patricio Rey y sus Redonditos de Ricota or R2, an Argentine rock band
  • Region 2, a DVD region code

Science and technology

  • R<sup>2</sup> or r<sup>2</sup> (pronounced R-squared), the coefficient of determination of a linear regression in statistics
  • R<sup>2</sup>, the two-dimensional real coordinate space in mathematics
  • R2: Risk of explosion by shock, friction, fire or other sources of ignition, a risk phrase in chemistry
  • R2 RNA element, a cis-acting element identified in R2 retrotransposons which is involved in priming the reverse transcription process
  • ATC code R02 Throat preparations, a section of the Anatomical Therapeutic Chemical Classification System
  • Haplogroup R2 (Y-DNA), a human Y-chromosome haplogroup
  • receptor 2, the second in line of a series of cellular receptors, generally at the end of an acronym
  • Gangrene (ICD-10 code)
  • Robonaut 2, a NASA humanoid robotic development project
  • R2 signalling, a family of telephony protocols for line and register signalling

Computing

  • .r02, a RAR file extension
  • Radare2, an open source reverse engineering framework also known as r2

Transportation

  • R2 (Rodalies de Catalunya), a commuter rail line in Barcelona, Catalonia, Spain
  • R2 (RER Vaud), an S-Bahn line in the canton of Vaud

<!--R2 (SEPTA) redirects here-->

  • Wilmington/Newark Line (R2 Wilmington/Newark line)
  • Warminster Line (R2 Warminster line)
  • Radial Road 2 or R-2, an arterial road of Manila, Philippines
  • Autopista Radial R-2, a Spanish radial motorway connecting Madrid to Guadalajara and passing through Alcobendas and connecting to N-320
  • R2 expressway (Slovakia)
  • R2 Marine Dr, an express bus route in Metro Vancouver, British Columbia, Canada
  • R2 road (Zimbabwe), a road connecting Plumtree and Harare
  • Orenburg Airlines (IATA code)

Vehicles

  • R2, a sub-class of Group R rally cars
  • DFW R.II, a 1918 German bomber aircraft
  • Fiat R.2, a 1919 Italian reconnaissance aircraft
  • HMS Zest (R02), a World War II British Royal Navy Z-class destroyer
  • Jaguar R2, Jaguar Racing's car for the 2001 Formula One season
  • Linke-Hofmann R.II, a World War I German bomber aircraft
  • ORA R2, a Chinese electric city car
  • Panzer 35(t), a Czech tank whose Romanian model was known as the R-2.
  • Polikarpov R-2, a Soviet Union copy of the 1931 British Airco DH.9A light bomber aircraft
  • Rivian R2, an upcoming all-electric mid-size SUV.
  • Ross R-2 Ibis, a glider
  • Subaru R2, a 2003 Japanese car
  • USS R-2 (SS-79), a 1918 R-class coastal and harbor defense submarine of the US Navy

Other uses

  • BBC Radio 2, a British radio station
  • R-2 (missile), an improved version of German V-2 rocket manufactured by the Soviet Union
  • R2 is a rank of United States research university in the Carnegie Classification of Institutions of Higher Education

See also

  • Windows Server 2003 R2
  • Windows Server 2008 R2
  • SQL Server 2008 R2
  • 2R (disambiguation)
  • R–2R ladder, a resistor ladder