R4

R4, R04, R.4, R-4, or R/4 may refer to:

• R4 (New York City Subway car)
• R4: Ridge Racer Type 4, a racing game for Sony PlayStation, developed by Namco
• Rush Rush Rally Racing, a racing game for Sega Dreamcast, developed by Senile Team
• Plan R 4, the World War II British plan for an invasion of the neutral state of Norway in April 1940
• R4DS, a Nintendo DS storage device
• Region 4, the DVD region code for most of Mexico, Central America, South America, Australia, New Zealand, Oceania

Aircraft

• Caudron R.4, World War I French reconnaissance aircraft, first flown in 1915
• Curtiss R-4, air ambulance version of the American Curtiss Model R utility aircraft, first flown in 1915
• Sikorsky R-4, American helicopter, first flown in 1942

Cars

• R4, abbreviation for rear-engine, four-wheel drive layout
• Jaguar R4, Jaguar Racing's car for the 2003 Formula One season
• McRae R4, a rally car designed in part by Colin McRae
• Renault R4, alternative name for the Renault 4
• Suzuki GSX-R/4, a concept car made by Suzuki in 2001

SEPTA

• Fox Chase Line, later cut back to Fox Chase and now known as the Fox Chase Line.
• Local service to Bryn Mawr on the Paoli/Thorndale Line, now known as the Paoli/Thorndale Line.

Roads

• R4 ring road in Ghent, Belgium
• R4 expressway (Czech Republic)
• R4 expressway (Slovakia)
• R-4 motorway (Spain)

Ships

• HMCS Cayuga (R04), Royal Canadian Navy destroyer
• USS R-4 (SS-81), U.S. Navy submarine

Buildings

• R4, a building in the Norwegian Government quarter (Norw. Regjeringskvartalet)

Science

• R4, designation of R-phrase (risk phrase) "Forms very sensitive explosive metallic compounds"
• R4 nuclear reactor, the fourth nuclear reactor built in Sweden
• Exotic R⁴, in mathematics, a differentiable manifold
• R04, WHO ICD-10 Chapter XVIII: Symptoms, signs and abnormal clinical and laboratory findings code for "Haemorrhage from respiratory passages"

Weapons

• R4 assault rifle, produced by South African manufacturer Vektor
• Bisnovat R-4, Soviet missile

Radio Stations

BBC Radio 4 the premier bbc speech radio station

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