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RedTube
RedTube is a free adult video sharing website opened in 2007 as one of the early YouTube-style tube sites, now operated by Cyprus-based Aylo Freesites Ltd, a sister site of Pornhub and YouPorn.
Reduced graphene oxide
Reduced graphene oxide (rGO), or chemically reduced graphene oxide (CReGO), is a graphene-like material produced by removing oxygen groups to restore electrical conductivity for use in sensors and electronics.
Reduced instruction set computer
A reduced instruction set computer (RISC), or RISC processor, is a microprocessor architecture built on a small set of simple, one-cycle instructions, arising from IBM research in the late 1970s.
Reduced vertical separation minima
Reduced vertical separation minima (RVSM) is an aviation standard that reduces the vertical separation between aircraft from 2,000 to 1,000 feet between flight levels 290 and 410.
Reduced-gravity aircraft
A reduced-gravity aircraft, nicknamed the Vomit Comet, flies steep parabolic arcs giving passengers about 20 seconds of weightlessness, used by space agencies to train astronauts and test equipment.
Reduced-order modeling
Reduced-order modeling (ROM) builds low-dimensional surrogates of high-dimensional simulations of complex systems, running orders of magnitude faster than the full-order model while retaining most of its accuracy, most commonly by POD-Galerkin projection.
Reduced-state sequence estimation
Reduced-state sequence estimation (RSSE) is a family of reduced-complexity trellis detectors for intersymbol interference channels, introduced by Eyuboğlu and Qureshi in 1988, recovering most of full MLSE performance at far lower complexity.
Reductive catalytic fractionation
Reductive catalytic fractionation (RCF) is a lignin-first biorefinery method that extracts lignin from intact biomass using a polar solvent, metal catalyst, and hydrogen source, stabilizing fragments before they repolymerize.
Redundancy resolution
Redundancy resolution is the problem of choosing one motion for a kinematically redundant robot manipulator, one with more joint degrees of freedom than its task requires.
Redundant manipulator
A redundant manipulator is a robotic arm with more joints than its task requires, letting it avoid obstacles and singularities while tracking the end-effector path.
Redundant word line
A redundant word line is a spare row-select line in a semiconductor memory that replaces a defective word line at the same address, improving manufacturing yield of DRAM.
Redwater fractionation complex
The Redwater fractionation complex is a natural gas liquids fractionation and storage facility in Redwater, Alberta, owned by Pembina Pipeline and the largest in Canada.
Redwood Research
Redwood Research is a nonprofit AI safety research organization based in Berkeley, California, founded in 2021 and led by CEO Buck Shlegeris, best known for originating the research field of AI control.
Reed boat
A reed boat is a watercraft built from bundles of buoyant reeds lashed with rope, independently developed where reeds grow, from Peru and Lake Titicaca to Iraq and the Nile.
Reed canary grass
Reed canary grass (Phalaris arundinacea) is a perennial grass native to Europe, grown for forage and, since the 1990s, as a biomass crop for solid biofuel.
Reed Hundt
Reed Hundt is an American lawyer and regulator who chaired the Federal Communications Commission from 1993 to 1997, overseeing the first U.S. spectrum auctions and the Telecommunications Act of 1996.
Reed switch
A reed switch, also known as a reed sensor, is an electromechanical switch whose two ferromagnetic blades in a sealed glass tube close when magnetized, needing no power.
Reedy Creek Gas Field
Reedy Creek Gas Field is a coal seam gas field in the Surat Basin of southeast Queensland, about 49 km north of Yuleba, developed by Australia Pacific LNG.
Reef Island (Bahrain)
Reef Island (جزيرة ريف), formerly Lulu Island, is a luxury freehold artificial island off Manama, Bahrain, with about 1,217 apartments, 65 villas, and a five-star resort.
Reef knot
The reef knot, also called the square knot, is a binding knot formed by two overhand knots of opposite handedness, used to bind a line tightly around an object.
Reefer ship
A reefer ship, or refrigerated cargo ship, carries perishable cargo such as fruit, meat, and fish in insulated holds cooled by the ship's own refrigeration plant.
Reel-to-reel audio tape recording
Reel-to-reel audio tape recording, also called open-reel, is an analog magnetic tape format wound on open reels, dominant in professional and broadcast recording from the late 1940s until digital formats displaced it.
ReelShort
ReelShort is a vertical micro-drama streaming app operated by California's Crazy Maple Studio, launched in 2022 and known for minute-long episodes of serialized romance and revenge dramas.
REEM
REEM is a wheeled humanoid service robot developed by PAL Robotics of Barcelona, Spain, used as a guide and receptionist in hotels, museums, and airports.
Reentered spacecraft, 1970–1979
The reentered spacecraft of 1970–1979 include the Soyuz 11 crew lost during descent in 1971, Cosmos 954's reactor over Canada in 1978, and Skylab in July 1979.
Reentered spacecraft, 1980–1989
Covers spacecraft reentries from 1980 to 1989, a decade averaging about 100 large reentries yearly, from routine Shuttle landings to Soviet stations deorbited over the Pacific.
Reentered spacecraft, 1990–1999
Reentered spacecraft, 1990–1999 surveys roughly 50 to 110 cataloged reentries each year, defined by the uncontrolled 1991 reentry of the 40-tonne Salyut 7 station over Argentina.
Reference 57260
Reference 57260 is a double-dial pocket watch by Vacheron Constantin, presented in September 2015 with 57 complications, then the most complicated watch ever built, after eight years of work by three master watchmakers.
Reference counting
Reference counting is a garbage collection technique in which each object carries a count of its references and is freed when the count reaches zero.
Reference data management
Reference data management governs the code lists (ISO 3166 country codes, ISO 4217 currencies, NACE, LEI) that constrain other data; a subset of master data requiring versioning, ownership, and controlled change.