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Royal School of Military Engineering
The Royal School of Military Engineering, also called the School of Military Engineering, Chatham, is the British Army's training establishment for the Royal Engineers, founded at Chatham in 1812.
Royal State Railways of Siam
The Royal State Railways of Siam was the state railway organization of the Kingdom of Siam, established in 1890 and renamed the State Railway of Thailand in 1951.
Royal Swedish Academy of Engineering Sciences
The Royal Swedish Academy of Engineering Sciences (IVA, Kungl. Ingenjörsvetenskapsakademien) is an independent Swedish academy founded in 1919, the world's oldest academy of engineering sciences.
Royal yacht
A royal yacht is a ship placed at the disposal of a monarch or royal family for official visits and state receptions, the type's best-known example being Britain's HMY Britannia.
Rozdilna-Izmail Gas Pipeline
The Rozdilna-Izmail Gas Pipeline is a natural gas pipeline running from Rozdilna in Ukraine through southern Moldova to Izmail, part of the Trans-Balkan route to the Balkans.
Rozhkovskoye Gas and Condensate Field
The Rozhkovskoye gas and condensate field is a pre-salt gas and condensate field in West Kazakhstan, discovered in 2008, commissioned in December 2023, and operated by Ural Oil and Gas.
RP (complexity class)
RP, short for randomized polynomial time, is the complexity class of decision problems solvable in polynomial time by randomized algorithms that never accept a no-instance, sitting between P and BPP.
RP-1
RP-1, or Rocket Propellant 1, is a highly refined kerosene used with liquid oxygen in rockets such as the Atlas, Saturn V, and SpaceX Falcon 9.
RP2350
RP2350 is a 32-bit dual-core microcontroller family designed by Raspberry Pi and released in August 2024, succeeding the RP2040 and debuting on the $5 Pico 2.
RPD machine gun
The RPD, or Ruchnoy Pulemyot Degtyaryova, is a Soviet 7.62×39mm belt-fed light machine gun designed by Vasily Degtyaryov and first issued to Soviet infantry in 1953.
RPG (programming language)
RPG, short for Report Program Generator, is a business-oriented programming language created by IBM in 1961 for producing reports from punched-card data on the IBM 1401.
RPG-2
The RPG-2 (Russian РПГ-2) is a Soviet shoulder-fired recoilless launcher that fired the PG-2 grenade and was the standard Soviet infantry antitank weapon from 1949.
RPG-29
The RPG-29, also known as the RPG-29 Vampir, is a Soviet reusable shoulder-fired anti-tank grenade launcher adopted in 1989 that fires a tandem shaped-charge rocket built to defeat reactive armor.
RPG-32
The RPG-32, known in Russia as Barkas or Hashim and in Jordan as Nashshab, is a multi-caliber anti-tank launcher designed by Russia's Bazalt for Jordan.
RPG-7 (РПГ-7)
The RPG-7 (РПГ-7), from the Russian for hand-held anti-tank grenade launcher, is a Soviet reloadable, shoulder-fired launcher adopted in 1961 and still in service worldwide.
RPK (Ручной пулемёт Калашникова)
The RPK (Ruchnoy Pulemyot Kalashnikova) is a Soviet 7.62×39 mm light machine gun, a heavy-barreled, bipod-mounted derivative of the AKM adopted in 1961 to replace the RPD.
RPK-6 Vodopad
RPK-6 Vodopad, NATO name SS-N-16 Stallion, is a Soviet rocket-assisted anti-submarine system, in service since 1981, that fires homing torpedoes or nuclear depth charges from submarine torpedo tubes.
RPK-74 (РПК-74)
The RPK-74 is a Soviet 5.45×39mm light machine gun derived from the AK-74, adopted in 1974 as the squad automatic weapon of motorized rifle units.
RPL (networking protocol)
RPL, the Routing Protocol for Low-Power and Lossy Networks, is an IPv6 routing protocol standardized by the IETF in 2012 for constrained Internet of Things networks.
RPLIDAR
RPLIDAR is a family of low-cost 360-degree 2D laser range scanners made by Shanghai Slamtec, first released in 2012 for robot navigation, mapping, and obstacle avoidance.
RPM International
RPM International is a holding company based in Medina, Ohio that owns specialty coatings and sealants businesses, including Rust-Oleum, Tremco, and Zinsser, with $7.9 billion in fiscal 2026 net sales.
RPM Package Manager
RPM Package Manager, originally the Red Hat Package Manager, is a free, open-source package management system and .rpm file format for Linux distributions like Fedora.
RPO-A Shmel (РПО-А «Шмель»)
The RPO-A Shmel (РПО-А «Шмель") is a Soviet and Russian single-use, shoulder-fired 93 mm rocket launcher with a thermobaric warhead, adopted in 1988 and still used by Russia.
RR Donnelley
RR Donnelley, formally R.R. Donnelley & Sons Company and branded RRD, is a Chicago-based provider of marketing, packaging, print, and supply chain solutions, founded in 1864 and serving 92% of the Fortune 100.
RRS Discovery (1962)
RRS Discovery was a British Royal Research Ship, the third of four of the name, built in Aberdeen in 1962 for the National Institute of Oceanography and serving until 2012.
RRS James Cook
RRS James Cook is a British multidisciplinary oceanographic research vessel built in Norway in 2006, owned by NERC, and operated by the National Oceanography Centre in Southampton since 2007.
RS Group
RS Group is a British distributor of industrial and electronic products, founded in 1937 as Radiospares and serving over one million customers in more than 80 countries.
RS-232
RS-232 is a serial interface standard for connecting data terminal equipment to modems and peripherals, developed by the Electronic Industries Alliance in the early 1960s.
RS-24 Yars (РС-24 Ярс)
The RS-24 Yars (РС-24 Ярс) is a Russian three-stage solid-fuel intercontinental ballistic missile carrying MIRV warheads, fielded in road-mobile and silo versions since 2010 as the mainstay of Russia's land-based strategic force.
RS-25
The RS-25, or Space Shuttle Main Engine, is a reusable liquid hydrogen and liquid oxygen rocket engine that powered the Space Shuttle from 1981 to 2011.