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Rangefinder camera
A rangefinder camera measures the distance to its subject through two windows on the body and focuses by aligning two images, a design favored for street photography since the Leica II of 1932.
Ranger Energy Services
Ranger Energy Services is a Houston-based provider of high-specification well service rigs, wireline, and ancillary services, trading on the NYSE under RNGR since its 2017 IPO.
Ranger Uranium Mine
The Ranger Uranium Mine was an open-cut uranium mine near Jabiru in the Northern Territory, Australia's longest continually operating uranium mine, which produced over 132,000 tonnes of uranium ore concentrate before closing in 2021.
RangerBot
RangerBot is a low-cost autonomous underwater vehicle developed at Queensland University of Technology by Matthew Dunbabin and Feras Dayoub, which navigates coral reefs using onboard computer vision to detect crown-of-thorns starfish and deliver coral larvae.
Raniganj coalfield
The Raniganj coalfield is a coal-mining region in Paschim Bardhaman district, West Bengal, India, and the country's oldest coalfield, with commercial mining begun in 1774.
Ranjan Singh
Ranjan Singh is a terahertz photonics researcher and Professor of Electrical Engineering at the University of Notre Dame, known for on-chip topological beamforming for 6G wireless.
RankBrain
RankBrain is a machine-learning ranking system Google deployed in Search in 2015, its first deep learning system there, interpreting never-before-seen queries and ranking among Google's most important signals.
RankGPT
RankGPT is a framework introduced at EMNLP 2023 by Weiwei Sun and colleagues for using large language models as zero-shot listwise reranking agents in information retrieval.
Ranking
Ranking, also called league tables, is the task of ordering items so the most relevant or important appear first, central to information retrieval and search engines.
Rans Designs
Rans Designs, also known as Rans Inc, is an American light-aircraft manufacturer in Hays, Kansas, founded by Randy Schlitter in the mid-1970s, building the S-7 Courier and S-21 Outbound.
Rans S-12 Airaile
The Rans S-12 Airaile is an American two-seat, high-wing, pusher-configuration light aircraft sold in kit form for amateur construction by Rans Inc. of Hays, Kansas.
Ransomware
Ransomware, also known as cryptoworm or hostageware, is malware that encrypts data and demands payment to restore access; attackers may also steal data and demand a second payment for not releasing it.
Rao R. Tummala
Rao R. Tummala is an electrical and materials engineer who spent 25 years at IBM developing multichip packaging, then founded Georgia Tech's Packaging Research Center in 1993.
Rao Y. Surampalli
Rao Y. Surampalli is an American environmental engineer who spent 29 years at the U.S. EPA and was elected to the National Academy of Engineering in 2026.
Raphael C. Lee
Raphael C. Lee is an American surgeon and biomedical engineer at the University of Chicago whose research established repairing damaged cell membranes with amphiphilic copolymers.
Raphia oil field
The Raphia oil field is an operating onshore oil field in Chad's Bongor Basin, operated and 90 percent owned by CNPC and 10 percent by Chad's state oil company.
Rapid application development
Rapid application development (RAD), also called the RAD framework, is a software development methodology favoring speed, iterative prototyping, and user feedback, formalized by James Martin in 1991.
Rapid control prototyping
Rapid control prototyping (RCP) is a model-based design practice that automatically converts control algorithms from simulation tools into code run on real-time hardware, replacing hand coding.
Rapid Entire Body Assessment
Rapid Entire Body Assessment (REBA) is an observational ergonomic screening tool that scores a single working posture from 1 to 15 for musculoskeletal disorder risk, published in 2000.
Rapid gas decompression
Rapid gas decompression, also called explosive decompression, is a failure mode of elastomeric seals where dissolved gas expands faster than it can diffuse out, causing blisters and cracking.
Rapid prototyping
Rapid prototyping is the quick fabrication of a scale model of a physical part, historically by additive manufacturing, letting designers check form, fit, and function before production tooling.
Rapid sand filter
A rapid sand filter, also called a rapid gravity filter, passes chemically pre-treated water downward through coarse sand at high rates, typically 5 to 15 m³/m²/h, and is cleaned by backwashing.
Rapid shutdown
Rapid shutdown (RSD) is a National Electrical Code safety requirement, in effect since 2014, requiring rooftop solar array conductors to drop to safe voltage limits within seconds so firefighters avoid electrocution.
Rapid thermal processing
Rapid thermal processing (RTP) is a semiconductor manufacturing technique that heats a single silicon wafer with lamps to 500 to 1200 °C in under a minute.
Rapid transit
Rapid transit, also called rail rapid transit, is a class of urban public transport operating on its own right-of-way at higher speed and capacity than buses or trams.
Rapid Upper Limb Assessment
The Rapid Upper Limb Assessment (RULA) is an ergonomics survey method, published in 1993, that scores neck, trunk, and upper limb postures to screen for work-related upper limb disorders.
Rapid7
Rapid7 is an American cybersecurity company headquartered in Boston, Massachusetts, founded in 2000 and known for its InsightVM platform, InsightIDR SIEM, and the open source Metasploit framework.
RapidDestroyer
RapidDestroyer is a British radio frequency directed energy weapon developed by a Thales UK-led consortium to detect, track, and defeat drones and drone swarms by damaging their electronics.
RapidEye
RapidEye was a commercial Earth-observation constellation of five identical satellites, launched on a single rocket in August 2008 and operated until March 2020, delivering 5-meter multispectral imagery for agriculture.
RapidIO
RapidIO is a packet-switched fabric interconnect standard, directed by the RapidIO Trade Association, for linking processors, DSPs, memory, and peripherals in embedded systems such as wireless base stations.