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Red fuming nitric acid
Red fuming nitric acid (RFNA) is a storable liquid rocket oxidizer, made of concentrated nitric acid with dissolved nitrogen dioxide, which gives it a reddish color and toxic fumes.
Red Hat
Red Hat, Inc. is an American software company selling subscriptions for enterprise open source products like Red Hat Enterprise Linux and OpenShift, founded in 1993.
Red Hat Enterprise Linux
Red Hat Enterprise Linux (RHEL) is a commercial Linux distribution developed by Red Hat, a subsidiary of IBM, first released in 2002 and sold on a subscription basis.
Red Hat Linux
Red Hat Linux, also known as Red Hat Commercial Linux, was a Linux distribution first released by Red Hat in 1994 and discontinued in 2003.
Red Hill water crisis
The Red Hill water crisis was the November 2021 contamination of the U.S. Navy's drinking water at Joint Base Pearl Harbor-Hickam, Hawaii, affecting about 93,000 people.
Red House
Red House, Bexleyheath, London: Grade I listed 1859 house, Philip Webb's first commission for William Morris, Arts and Crafts birthplace, National Trust, open May to October.
Red Line (Delhi Metro)
The Red Line (Delhi Metro Line 1) runs from Shaheed Sthal in Ghaziabad to Rithala in Delhi, and opened in 2002 as the Delhi Metro's first line.
Red Line (Mumbai Metro)
The Red Line, numbered Line 7, is an elevated Mumbai Metro corridor along the Western Express Highway from Gundavali to Dahisar East, opened in 2022 and 2023.
Red Line (Namma Metro)
The Red Line, also called the Namma Metro Red Line, is a planned 37.8 km Bengaluru metro corridor from Hebbal to Sarjapur, designated Phase 3A.
Red Line Extension
The Red Line Extension is a Chicago Transit Authority project extending the Red Line 5.5 miles south to 130th Street, with four new stations, opening in 2030.
Red mercury
Red mercury is a purported substance, supposedly used in nuclear weapons, that has never been shown to exist; black-market sales since the late 1980s were fraud.
Red mud
Red mud, also known as bauxite residue or red sludge, is the alkaline iron-rich waste produced when alumina is extracted from bauxite ore in the Bayer process.
Red Sea Global
Red Sea Global (RSG), formerly The Red Sea Development Company, is a Saudi real estate developer wholly owned by the Public Investment Fund, created for Vision 2030.
Red Sea–India submarine telegraph cable
The Red Sea–India submarine telegraph cable was a failed 1859–1860 attempt to link Britain and India by undersea wire from Suez to Karachi, abandoned by 1861.
Red Star OS
Red Star OS, also known as Pulgunbyol or Red Star Linux, is a North Korean Linux distribution developed by the Korea Computer Center in Pyongyang, built on Fedora Linux since 1998.
Red Storm Entertainment
Red Storm Entertainment, also known as Ubisoft Red Storm, is a video game studio in Cary, North Carolina, founded by Tom Clancy in 1996 and known for Rainbow Six and Ghost Recon.
Red Stripe
Red Stripe is a line of grooved ABS inclinometer casings, product code S131, made by Sisgeo of Masate, Italy, and used to measure sub-surface ground displacement.
Red Tail Squadron
The Red Tail Squadron, also called the Red Tail Project, is a Commemorative Air Force outreach program that honors the Tuskegee Airmen with a restored red-tailed P-51C Mustang.
Red Tails
Red Tails (2012) is a Lucasfilm war drama directed by Anthony Hemingway, executive produced by George Lucas, dramatizing the Tuskegee Airmen's WWII bomber-escort missions; Cuba Gooding Jr. and Terrence Howard star; mixed reviews, $49.9M US gross.
Red telephone box
The red telephone box, also called the red phone box or booth, is a cast-iron public telephone kiosk in the United Kingdom, first introduced in 1924.
Red Top (missile)
Red Top was a British infrared-homing air-to-air missile developed by de Havilland, in service from 1964 to 1988 as an uprated successor to the Firestreak.
Red Whittaker
Red Whittaker is an American roboticist at Carnegie Mellon University known as the father of field robotics and winner of the 2007 DARPA Urban Challenge.
Red-eye effect
The red-eye effect is a photographic artifact where flash light entering dilated pupils reflects off blood vessels at the back of the eye, making pupils appear red in photos.
Red-eye flight
A red-eye flight is an overnight airline flight departing late at night and arriving early the next morning, named for the tired eyes of sleepless passengers.
Red-light running
Red-light running is the act of a driver entering an intersection after the traffic signal has turned red; drivers already in the intersection when the signal changes are not violators.
Red-teaming (foundation models)
Red-teaming of foundation models is the structured adversarial testing of AI systems to find harmful capabilities, outputs, or vulnerabilities, formalized by OpenAI, government mandates, and benchmarks like HarmBench.
Red-teaming of image and video generation models
Red-teaming of image and video generation models systematically searches for prompts that bypass safety filters in diffusion-based text-to-image and text-to-video systems, a distinct safety subfield since 2023.
Red–black tree
A red–black tree, or symmetric binary B-tree, is a self-balancing binary search tree invented by Rudolf Bayer in 1972 and used in Java's TreeMap, C++ std::map, and the Linux kernel.
Redaction
Redaction is the removal or blocking out of sensitive, identifying, or otherwise non-disclosable information from documents and datasets before they are released, especially in government contexts.
Redaptive
Redaptive is an American energy technology company, founded in 2015 and based in Denver, Colorado, that funds, installs, and owns efficiency equipment such as LED lighting, HVAC, and solar.