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

Entertainment

* ''R2'' (Rock'n'Reel), a British music magazine *

R2-D2 R2-D2 () or Artoo-Detoo is a fictional robot character in the ''Star Wars'' franchise created by George Lucas. He has appeared in ten of the eleven theatrical ''Star Wars'' films to date, including every film in the " Skywalker Saga", which inclu ...

, a character from ''Star Wars'' films and books, nickname R2 * '' Code Geass: Lelouch of the Rebellion R2'', a 2008 anime series * ''

Resistance 2 ''Resistance 2'' is a 2008 first-person shooter video game developed by Insomniac Games and published by Sony Computer Entertainment for the PlayStation 3. The game was released in North America on November 4, 2008, in Australia on November 27, ...

'', a video game * '' Relapse 2'', a 2009 album by rapper Eminem *

Patricio Rey y sus Redonditos de Ricota Patricio Rey y sus Redonditos de Ricota, also known simply as Patricio Rey, Los Redondos or Los Redonditos de Ricota, was a rock band formed in La Plata, Argentina. The group was active from the mid 70s up to the early 2000s. They are known for ...

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 t ...

Science and technology

* R² or r² (pronounced R-squared), 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 in t ...

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

real coordinate space In mathematics, the real coordinate space or real coordinate ''n''-space, of dimension , denoted or , is the set of all ordered -tuples of real numbers, that is the set of all sequences of real numbers, also known as '' coordinate vectors''. ...

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 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 Signalling System R2 is a signalling protocol for telecommunications that was in use from the 1960s mostly in Europe, and later also in Latin America, Asia, and Australia, to convey exchange information between two telephone switching systems for es ...

, a family of telephony protocols for line and register signalling

Computing

* .r02, a RAR file extension *

Radare2 Radare2 (also known as r2) is a complete framework for reverse-engineering and analyzing binaries; composed of a set of small utilities that can be used together or independently from the command line. Built around a disassembler for computer s ...

, an open source reverse engineering framework also known as r2

Transportation

R2 (Rodalies de Catalunya) The R2 is a line of Rodalies de Catalunya's Barcelona commuter rail service, operated by Renfe Operadora and the Generalitat de Catalunya government. It is a major north–south axis in the Barcelona metropolitan area, running from the southern l ...

, a commuter rail line in Barcelona, Catalonia, Spain *

R2 (RER Vaud) The R2 is a railway service of RER Vaud that provides hourly service between and in the Swiss canton of Vaud. Swiss Federal Railways Swiss Federal Railways (, SBB; , CFF; , FFS) is the national railway company of Switzerland. The company ...

, an S-Bahn line in the canton of Vaud *

Wilmington/Newark Line The Wilmington/Newark Line is a route of the SEPTA Regional Rail commuter rail system in the Philadelphia area. The line serves southeastern Pennsylvania and northern Delaware, with stations in Marcus Hook, Pennsylvania, Wilmington, Delaware, and ...

(''R2 Wilmington/Newark line'') *

Warminster Line The Warminster Line is a route of the SEPTA Regional Rail commuter rail system. It serves stations between its namesake town, Warminster (SEPTA station), Warminster, and Center City, Philadelphia, Center City Philadelphia. Half of the route is s ...

(''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 which comprise the second arterial road of Metro Manila in the Philippines. Spanning some , it connects the cities and municipalities of Bacoor, Dasmariñas, ...

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 Highways in Slovakia, expressway () in Slovakia, which begins near Trenčín and ends near Košice. It passes Bánovce nad Bebravou, Prievidza, Žiar nad Hronom, Zvolen, Lučenec, Rimavská Sobota and Rožňava. Sections between Žiar n ...

R2 Marine Dr The R2 Marine Dr is an express bus service with bus rapid transit elements in Metro Vancouver, British Columbia, Canada. Part of TransLink's RapidBus network, it travels along Marine Drive, 3rd Street, Cotton Road, and Main Street in North ...

, an express bus route in Metro Vancouver, British Columbia, Canada *

R2 road (Zimbabwe) The R2 Road is an international road in Zimbabwe that runs from Harare (Capital of Zimbabwe), through Bulawayo, to Plumtree border post. It is a combination of the A5 Highway which is the Harare-Bulawayo Highway and the A7 Highway which is th ...

, a road connecting Plumtree and Harare *

Orenburg Airlines Orenburg Airlines or JSC Orenair () was a Russian airline with its head office on the property of Orenburg Tsentralny Airport in Orenburg. It operated domestic passenger services and inclusive tour charters, as well as aerial work and special f ...

(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) The Panzerkampfwagen 35(t), commonly shortened to Panzer 35(t) or abbreviated as Pz.Kpfw. 35(t), was a Czechoslovakia, Czechoslovak-designed light tank used mainly by Nazi Germany during World War II. The letter (t) stood for ''tschechisch'' (Ge ...

, 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 * Ross R-2 Ibis, a glider *

Subaru R2 The Subaru R2 is a kei car Kei car is the smallest category of Japanese expressway-legal motor vehicles. The term ''kei'' is a shortening of , (kanji: ), which translates to English as "light vehicle" (). With restricted dimensions and e ...

, 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 List of most-listened-to radio programs, most popular station in the United Kingdom with over 14 million weekly listeners. Since launching in 1967, the sta ...

, a British radio station *

R-2 (missile) The R-2 (NATO reporting name SS-2 Sibling) was a Soviet short-range ballistic missile developed from and having twice the range as the R-1 missile (itself a copy of the German V-2). Developed from 1946-1951, the R-2 entered service in numbers i ...

, an improved version of German V-2 rocket manufactured by the Soviet Union * R2 is a rank of United States

research university A research university or a research-intensive university is a university that is committed to research as a central part of its mission. They are "the key sites of Knowledge production modes, knowledge production", along with "intergenerational ...

in the