R3, R.III or R-3 or R/3 may refer to:

Aviation

DFW R.III __NOTOC__ The DFW R.III was a German bomber aircraft designed during World War I, but which had not yet been built when the end of the war led to the project's cancellation. Conceptually similar to DFW's preceding R.I and R.II designs, the R.I ...

, a World War I German bomber aircraft *

Ross R-3 The Ross RH-3 is a single seat, mid-wing glider that was designed by Harland Ross.Said, Bob: ''1983 Sailplane Directory, Soaring Magazine'', page 60. Soaring Society of America, November 1983. USPS 499-920 Design and development Ross designed ...

glider *

Tupolev R-3 The ANT-3 was a Soviet all-metal aircraft designed by the Tupolev Design Bureau. Tupolev acquired much experience in building his first two aircraft, later using his experience to construct the ANT-3. By this time, Soviet Air Force leaders we ...

Soviet reconnaissance aircraft * Yakutia Airlines IATA airline designator

Entertainment

BBC Radio 3 BBC Radio 3 is a British national radio station owned and operated by the BBC. It replaced the BBC Third Programme in 1967 and broadcasts classical music and opera, with jazz, world music, Radio drama, drama, High culture, culture and the arts ...

, 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 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 ...

for Southeast Asia, South Korea, Republic of China (Taiwan), Hong Kong, Macau * ''

Resistance 3 ''Resistance 3'' is a 2011 science fiction post-apocalyptic first-person shooter developed by Insomniac Games and published by Sony Computer Entertainment for the PlayStation 3. ''Resistance 3'' is the final installment in the ''Resistance'' tril ...

'', 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 (missile) The Vympel K-13 (NATO reporting name: AA-2 "Atoll") is a short-range, infrared homing air-to-air missile developed by the Soviet Union. It is similar in appearance and function to the American AIM-9B Sidewinder from which it was reverse-engineere ...

, the Vympel K-13, an air-to-air missile also known as R-3S in Soviet service *

R-3 (tank) R-3 was a proposed Romanian tank design for use in World War II. It was basically a variant of the Czechoslovak S-II-c tank prototype (known as the T-21 tank after 1939) which was going to be built in Romania because of the repeated acquisition ...

, 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

Math and Science

* R3: Extreme risk of explosion by shock, friction, fire or other sources of ignition, a risk phrase in chemistry *

R-3 process 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 En ...

, a chromogenic photo process for making

Type R print A chromogenic print, also known as a C-print or C-type print, a silver halide print, or a dye coupler print, is a photographic print made from a color negative, transparency or digital image, and developed using a chromogenic process. They are co ...

s * R3 or ''receptor 3'', the third 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 * 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) R3 is a mostly planned expressway ( sk, rýchlostná cesta) passing through central Slovakia in the north–south direction along the European route E77. It goes from border with Hungary, moving north around Krupina to Zvolen, from there is curre ...

, a road connecting Krupina and Zvolen *

Radial Road 3 Radial Road 3 (R-3), informally known as the R-3 Road, is a network of roads and bridges that all together form the third arterial road of Metro Manila in the Philippines. Spanning some , it connects the cities and municipalities of Batangas, Biña ...

or R-3, an arterial road of Manila, Philippines *

R-3 motorway (Spain) The R-3 motorway (''Autopista Radial R-3'') is a Spanish motorway connecting Madrid (M-30), Arganda del Rey (A-3) and Tarancón Tarancón is a municipality of Spain located in the province of Cuenca, Castilla–La Mancha. As of 2018, it has a po ...

, a road connecting Madrid and Tarancón * R3 (SEPTA), a former commuter rail line in and near Philadelphia, Pennsylvania, which has been split into: ** Media/Wawa Line '' (R3 Media/Elwyn, formerly R3 West Chester), '' **

West Trenton Line (SEPTA) The West Trenton Line is a SEPTA Regional Rail service connecting Center City Philadelphia to the West Trenton section of Ewing Township, New Jersey. With around 12,000 riders every weekday, it is the third busiest line in the SEPTA Regional R ...

''(R3 West Trenton)'' * R3 (ring road) in Belgium *

R3 (Rodalies de Catalunya) The R3 is a line of Rodalies de Catalunya's Barcelona commuter rail service, operated by Renfe Operadora. It runs northwards from the Barcelona area to the French border town of Latour-de-Carol, passing through the Vallès Oriental, Osona and R ...

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

R3 Lougheed Highway The R3 Lougheed Hwy is an express bus service with bus rapid transit elements in Metro Vancouver Regional District, Metro Vancouver, British Columbia, Canada. Part of TransLink (British Columbia), TransLink's RapidBus (TransLink), RapidBus netw ...

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

Other uses

* Ågestaverket, also known as R3, was the third nuclear reactor built in Sweden *

Jaguar R3 The Jaguar R3 is a Formula One racing car with which Jaguar Racing competed in the 2002 Formula One season. The car was launched on 4 January 2002. It was driven by Eddie Irvine and Pedro de la Rosa, both retained from 2001. A "B Specification" ...

, 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 The Yamaha YZF-R3, commonly R3, is a inline-twin sport bike made by Yamaha since 2015. The R3 and the R25 are the first Yamaha twins with an offset cylinder design. The YZF-R3 was updated for 2019. Design The Yamaha R3 is an entry level spo ...

ISO Recommendation R3 Renard series are a system of preferred numbers dividing an interval from 1 to 10 into 5, 10, 20, or 40 steps. This set of preferred numbers was proposed in 1877 by French army engineer Colonel Charles Renard. His system was adopted by the ISO i ...