R2, R02, R.II, R-2, or similar may refer to:
Arts, media, and entertainment
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 Region 2, a DVD region code BBC Radio 2, a British radio station
Music R2 (Rock'n'Reel), a British music magazine Relapse 2, a 2009 album by rapper Eminem Patricio Rey y sus Redonditos de Ricota or R2, an Argentine rock band
Science and technology
R2: Risk of explosion by shock, friction, fire or other sources of ignition, a risk phrase in chemistry
Mathematics R2 or r2 (pronounced R-squared), the coefficient of determination of a linear regression in statistics R2, the two-dimensional real coordinate space
Biology and medicine 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)
Computing Robonaut 2, a NASA humanoid robotic development project R2 signalling, a family of telephony protocols for line and register signalling .r02, a RAR file extension Radare2, an open source reverse engineering framework also known as r2
Transportation Orenburg Airlines (IATA code)
Roads 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
Railroads
R2 (Rodalies de Catalunya), a commuter rail line in Barcelona, Catalonia, Spain R2 (RER Vaud), an S-Bahn line in the canton of Vaud
Southeastern Pennsylvania Transportation Authority (SEPTA)
Wilmington/Newark Line (R2 Wilmington/Newark line) Warminster Line (R2 Warminster line)
Vehicles
Land vehicles R2, a sub-class of Group R rally cars Jaguar R2, Jaguar Racing's car for the 2001 Formula One season ORA R2, a Chinese electric city car Panzer 35(t), a Czech tank whose Romanian model was known as the R-2 Rivian R2, an upcoming all-electric mid-size SUV Subaru R2, a 2003 Japanese car
Air vehicles DFW R.II, a 1918 German bomber aircraft Fiat R.2, a 1919 Italian reconnaissance aircraft Linke-Hofmann R.II, a World War I German bomber aircraft Polikarpov R-2, a Soviet Union copy of the 1931 British Airco DH.9A light bomber aircraft Ross R-2 Ibis, a glider
Water vehicles HMS Zest (R02), a World War II British Royal Navy Z-class destroyer USS R-2 (SS-79), a 1918 R-class coastal and harbor defense submarine of the US Navy
Other uses 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 RR (disambiguation) 2R (disambiguation) R–2R ladder, a resistor ladder