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Reykjavík Airport
Reykjavík Airport, also known as Reykjavíkurflugvöllur, is the main domestic airport of Iceland, built by occupying British forces in World War II and presented to Iceland in 1946.
Reynold Xin
Reynold Xin, Canadian computer scientist, is a Databricks co-founder and Chief Architect who designed Apache Spark's DataFrames, Project Tungsten, GraphX, and Structured Streaming, and led the 2014 100 TB sort world record.
Reza Shahbazian‐Yassar
Reza Shahbazian-Yassar is a mechanical and materials engineer and professor at the University of Illinois Chicago who studies battery materials with in situ electron microscopy.
Rezolve AI plc
Rezolve AI plc, formerly Rezolve Group Limited, is a London-headquartered AI-powered commerce technology company founded by Daniel Wagner, listed on Nasdaq under the ticker RZLV.
RF cavity filter
An RF cavity filter is a high-Q radio-frequency filter built from resonant metal cavities, preferred from about 40 to 960 MHz and used in FM and TV broadcast plants.
RF energy harvesting
RF energy harvesting converts ambient radio-frequency energy from sources like Wi-Fi and broadcast towers into DC power for battery-free sensors, RFID tags, and other low-power electronics.
RF fingerprinting
RF fingerprinting, also called radio frequency fingerprint identification or specific emitter identification, is a physical-layer technique that identifies a wireless transmitter from hardware-intrinsic imperfections in its waveform, without shared credentials.
RF MEMS switch
An RF MEMS switch is a microelectromechanical device that routes radio-frequency signals by moving a microscopic conductive beam, offering relay-like linearity with low power use.
RFA One
RFA One is a three-stage small orbital launch vehicle developed by Rocket Factory Augsburg, a German company majority-owned by OHB, designed to carry small satellites to low Earth orbit.
RFC 1
RFC 1, titled Host Software, is the first document in the Request for Comments series, written by Steve Crocker of UCLA and issued in April 1969.
RFC Editor
The RFC Editor is the publication function that edits, publishes, and archives the Request for Comments (RFC) series, the Internet's technical document series running since 1969.
RFdiffusion
RFdiffusion is an open-source generative model for de novo protein design, described in Nature in 2023 by David Baker's lab at the University of Washington.
RFX
RFX (Reversed Field eXperiment) is the largest reversed-field pinch magnetic confinement fusion experiment, built in Padua, Italy, producing first plasma in 1991 and now operating as RFX-mod2 for both RFP and tokamak research.
RG-31 Nyala
The RG-31 Nyala is a South African 4x4 mine-protected armored personnel carrier developed in the mid-1990s from the Mamba design, with a V-shaped hull that deflects mine blasts.
RGB color model
The RGB color model represents colors as additive combinations of red, green, and blue primary lights, and is the working model of most electronic displays and digital cameras.
RGB-D salient object detection
RGB-D salient object detection (RGB-D SOD) is a computer vision task that finds the most prominent objects in a scene using a color image plus a depth map.
RGB-D SLAM
RGB-D SLAM is a form of visual simultaneous localization and mapping in which an RGB-D camera supplies color and depth, removing the scale ambiguity of monocular systems.
RH5 (robot)
RH5 is a full-size humanoid robot developed by the German Research Center for Artificial Intelligence (DFKI) in Bremen, Germany, standing 2 m tall and weighing about 62.5 kg.
Rhaetian Railway Ge 6/6 I
The Rhaetian Railway Ge 6/6 I, nicknamed the Rhaetian Crocodile, is a six-axle electric locomotive built for the Swiss RhB railway between 1921 and 1929.
Rheinmetall
Rheinmetall AG, also known as Rheinmetall, is a German defense technology group in Düsseldorf that supplies armed forces with vehicles, weapons, ammunition, and air defense systems.
Rheinmetall Automotive
Rheinmetall Automotive was the civilian automotive-supplier arm of Germany's Rheinmetall AG, built from Kolbenschmidt Pierburg and sold to the Munich group AEQUITA in 2026, ending the parent's automotive business.
Rheinmetall Rh-120
The Rheinmetall Rh-120 is a German 120 mm smoothbore tank gun developed by Rheinmetall for the Leopard 2 and, as the M256, the M1A1/M1A2 Abrams.
Rheinmetall Sea Snake 30 mm
The Rheinmetall Sea Snake 30 is a remote-controlled naval weapon station with a 30 mm revolver cannon, firing up to 1,100 rounds per minute against drones and other close-range threats.
RHESSI
RHESSI (Reuven Ramaty High Energy Solar Spectroscopic Imager), originally HESSI, was a NASA satellite launched in 2002 to study solar flares in X-rays and gamma rays.
RHex
RHex (Robot Hexapod) is an untethered six-legged robot with compliant, half-circular legs, the first legged machine to achieve autonomous locomotion faster than one body length per second.
Rhine–Main–Danube Canal
The Rhine–Main–Danube Canal (Main-Donau-Kanal) is a 171-kilometer canal in Bavaria, Germany, built between 1960 and 1992 to link the Main and Danube, completing a 3,500-kilometer waterway from the North Sea to the Black Sea.
Rhino (robot)
Rhino was an autonomous museum tour-guide robot developed at the University of Bonn, deployed at the Deutsches Museum Bonn in May 1997 as the first museum tour-guide robot.
Rhinoceros 3D
Rhinoceros 3D, commonly called Rhino or Rhino3D, is a professional CAD program for Windows and macOS by Robert McNeel & Associates that models free-form shapes with NURBS surfaces.
Rho Motion
Rho Motion is a London-based market research firm founded in 2018, known for monthly global EV sales assessments and acquired by Benchmark Mineral Intelligence in 2024.
Rhode Island Department of Transportation
The Rhode Island Department of Transportation (RIDOT) is the state agency that designs, builds, and maintains Rhode Island's roads, bridges, rail stations, and bike paths, headquartered in Providence.