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 ''Recovery'' (stylized as ''RECOVƎRY'') is the seventh studio album by American rapper Eminem. It was released on June 18, 2010, by Aftermath Entertainment, Shady Records, and Interscope Records. It serves as a direct follow-up to last year’s ...

'', 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 DVD region codes are a digital rights management technique introduced in 1997. It is designed to allow rights holders to control the international distribution of a DVD release, including its content, release date, and price, all according to ...

Science and technology

* R² or ''r''² (pronounced R-square), the

coefficient of determination In statistics, the coefficient of determination, denoted ''R''2 or ''r''2 and pronounced "R squared", is the proportion of the variation in the dependent variable that is predictable from the independent variable(s). It is a statistic used i ...

of a linear regression in statistics * R², the two-dimensional

real coordinate space In mathematics, the real coordinate space of dimension , denoted ( ) or is the set of the -tuples of real numbers, that is the set of all sequences of real numbers. With component-wise addition and scalar multiplication, it is a real vector ...

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 R02A Throat preparations R02AA Antiseptics :R02AA01 Ambazone :R02AA02 Dequalinium :R02AA03 Dichlorobenzyl alcohol :R02AA05 Chlorhexidine :R02AA06 Cetylpyridinium :R02AA09 Benzethonium :R02AA10 Myristyl-benzalkonium :R02AA11 Chlorquinaldol :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 In biochemistry and pharmacology, receptors are chemical structures, composed of protein, that receive and transduce signals that may be integrated into biological systems. These signals are typically chemical messengers which bind to a recepto ...

, generally at the end of an acronym *

Gangrene Gangrene is a type of tissue death caused by a lack of blood supply. Symptoms may include a change in skin color to red or black, numbness, swelling, pain, skin breakdown, and coolness. The feet and hands are most commonly affected. If the ga ...

(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 RAR is a proprietary archive file format that supports data compression, error correction and file spanning. It was developed in 1993 by Russian software engineer Eugene Roshal and the software is licensed by ''win.rar GmbH''. The name ''RAR' ...

, 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 * Wilmington/Newark Line (''R2 Wilmington/Newark line'') * Warminster Line (''R2 Warminster line'') *

Radial Road 2 Radial Road 2 (R-2), informally known as the R-2 Road, is a network of roads and bridges that all together form the second arterial road of Metro Manila in the Philippines. Spanning some , it connects the cities and municipalities of Bacoor, Dasm ...

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 is an expressway ( sk, rýchlostná cesta) in Slovakia, also nicknamed the "southern highway". It starts near Trenčín and ends near Košice. It goes through or around Bánovce nad Bebravou, Prievidza, Žiar nad Hronom, Zvolen, Lučenec, Rima ...

* Orenburg Airlines (IATA code)

Vehicles

* R2, a sub-class of Group R rally cars *

DFW R.II The DFW R.II was a German bomber aircraft of World War I. It was developed at a request by the ''Luftstreitkräfte'' in spring 1917 after their experience with the R.I had been generally positive, but only two were ever built despite six being o ...

, 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 The Jaguar R2 was the car with which the Jaguar team competed in the Formula One season. It was driven by Eddie Irvine, who was in his second year with the team, and Luciano Burti, who had deputised for Irvine at the 2000 Austrian Grand Prix. ...

, Jaguar Racing's car for the 2001 Formula One season *

Linke-Hofmann R.II The Linke-Hofmann R.II (''Riesenflugzeug'' – "giant aircraft") was a bomber aircraft designed and built in Germany from 1917. Design and development The Linke-Hofmann R.I had disappointing performance and handling, as well as structural we ...

, 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 The Airco DH.9A was a British single-engined light bomber designed and first used shortly before the end of the First World War. It was a development of the unsuccessful Airco DH.9 bomber, featuring a strengthened structure and, crucially, repl ...

, a Soviet Union copy of the 1931 British Airco DH.9A light bomber aircraft *

Ross R-2 Ibis The Ross R-2 Ibis was a single seat, mid-wing, gull winged glider that was designed by Harland Ross in about 1938, under a commission from the Soaring Society of America. The sole example was destroyed in 1940.Said, Bob: ''1983 Sailplane Di ...

, 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 BBC Radio 2 is a British national radio station owned and operated by the BBC. It is the most popular station in the United Kingdom with over 15 million weekly listeners. Since launching in 1967, the station broadcasts a wide range of content. ...

, 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