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

Aviation

aircraft An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. ...

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 Air Company Yakutia (russian: Авиакомпания «Якутия» – ''Aviakompanija «Yakutiya»'') is an airline based in Yakutsk, Sakha Republic, Russia. It operates domestic passenger services in Russia and within the Commonwealth of ...

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, drama, culture and the arts also featuring. The st ...

, 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 ''Rheintochter'' was a German surface-to-air missile developed by Rheinmetall-Borsig during World War II. Its name comes from the mythical ''Rheintöchter'' (Rhinemaidens) of Richard Wagner's opera series ''Der Ring des Nibelungen''. The missil ...

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) USS ''R-3'' (SS-80) was an R-class coastal and harbor defense submarine of the United States Navy. Construction and commissioning ''R-3''′s keel was laid down on 11 December 1917 by the Fore River Shipbuilding Company in Quincy, Massachuset ...

, 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 prints * 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 Three-dimensional space (also: 3D space, 3-space or, rarely, tri-dimensional space) is a geometric setting in which three values (called ''parameters'') are required to determine the position of an element (i.e., point). This is the informal ...

, the Euclidean space of real numbers in three dimensions

Transportation

R3 expressway (Czech Republic) The D3 motorway ( cs, Dálnice D3) is a highway in the Czech Republic. Currently only the middle segment of the route is in operation; when complete, it will run from Prague via Tábor and České Budějovice to the Czech-Austrian border at Doln� ...

, a road connecting Kaplice and the border with Austria * R3 expressway (Slovakia), 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 (A-3). References Autopistas and autovías in Spain {{Spain-road-stub ...

, 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 The Media/Wawa Line is a SEPTA Regional Rail service that runs from Center City Philadelphia west to Wawa in Delaware County. It uses the West Chester Branch, which connects with the SEPTA Main Line at 30th Street Station. Under the Pennsyl ...

'' (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 ...

''(R3 West Trenton)'' *

R3 (ring road) The R3 is a ring road around the city of Charleroi, Belgium Belgium, ; french: Belgique ; german: Belgien officially the Kingdom of Belgium, is a country in Northwestern Europe. The country is bordered by the Netherlands to the north, ...

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, British Columbia, Canada. Part of TransLink's RapidBus network, it travels along Lougheed Highway and connects Coquitlam, Port Coquitlam, Pitt Me ...

, 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, a car made by Jaguar Racing for the 2002 Formula One season *

Leica R3 The Leica R3 was a 35mm SLR camera by Leica and the first model of their R series. Leica launched the Leica R3 in 1976. It was the successor of the Leicaflex SL2, and was developed in cooperation with Minolta, together with the Minolta XE bo ...

, a 1976 35mm SLR camera *

Reduce, reuse, recycle Waste hierarchy is a tool used in the evaluation of processes that protect the environment alongside resource and energy consumption from most favourable to least favourable actions. The hierarchy establishes preferred program priorities based ...

SAP R/3 SAP R/3 is the former name of the enterprise resource planning software produced by the German corporation SAP AG (now SAP SE). It is an enterprise-wide information system designed to coordinate all the resources, information, and activities needed ...

, the previous designation for an enterprise resource planning software produced by SAP AG; the new name is SAP ERP * Yamaha R3 *

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 ...

, a forerunner to the international standard ISO 3 *

Canon EOS R3 The Canon EOS R3 is a 24 megapixel full-frame mirrorless interchangeable-lens camera launched by Canon officially announced by Canon on 14 September 2021 alongside two RF mount lenses. The camera is available as body only with a MSRP of US$5,9 ...