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Skylark (rocket)
Skylark was a British solid-fuel sounding rocket developed by the Royal Aircraft Establishment between 1954 and 1956, first flown at Woomera in 1957 and retired in 2005 after 441 launches.
Skyleader
Skyleader is a Czech brand of two-seat ultralight and light-sport aircraft, also known as Jihlavan Airplanes, built in Jihlava, Czech Republic, with over 400 sold worldwide.
Skylight
A skylight is a glazed opening in a roof or ceiling that admits daylight from above, admitting over 3 times the light of a vertical window of the same size.
Skyliner
The Skyliner (スカイライナー) is Keisei Electric Railway's reserved-seat express train between Narita International Airport and central Tokyo, running since 1978 and reaching 160 km/h, the fastest in Japan outside the Shinkansen.
Skylon (spacecraft)
Skylon, also known as Reaction Engines Skylon, is a British concept for a fully reusable, unpiloted spaceplane powered by the air-breathing SABRE engine, developed from 1989 until 2024.
SkyMiles
SkyMiles is the frequent-flyer loyalty program of Delta Air Lines, launched in 1981 and renamed SkyMiles in 1995. Membership is free and miles do not expire.
Skynet (satellite)
Skynet is the United Kingdom Ministry of Defence's family of military communications satellites, in service since 1969 and now supplying NATO under an agreement running from 2020.
Skynet (Terminator)
Skynet, the Skynet Global Defense Network, is a fictional military AI in the Terminator franchise, first appearing in James Cameron's 1984 film The Terminator and becoming a cultural shorthand for dangerous AI.
Skynex
Skynex is a ground-based, networked short-range air defense system by Rheinmetall, first shown at Eurosatory 2016, using 35 mm revolver guns and programmable AHEAD rounds against drones and missiles.
Skype
Skype was a VoIP service launched in 2003 that offered free voice and video calls and messaging, retired by Microsoft in 2025 in favor of Teams.
Skype for Business
Skype for Business, the successor to Microsoft Lync, is a Microsoft enterprise instant messaging, voice, and video conferencing product launched in 2015; its online service retired in 2021 in favor of Microsoft Teams.
Skype Technologies
Skype Technologies, known as Skype Communications S.a.r.l., was the Luxembourg company that developed Skype, the VoIP calling service founded by Niklas Zennström and Janus Friis in 2003 and retired by Microsoft in 2025.
Skyports (company)
Skyports Infrastructure is a London-based company, founded in 2018, that designs and operates vertiports for eVTOL air taxis, including a Dubai network with Joby Aviation.
SkyReels
SkyReels is a family of open-weights, film-oriented video generation models developed by Skywork, first released in February 2025, spanning text-to-video, image-to-video, and talking avatars, and known for infinite-length generation.
SkySat
SkySat is a commercial Earth-observation constellation of 21 high-resolution imaging satellites built by Skybox Imaging and operated by Planet Labs since 2017, delivering 50 cm imagery and full-motion video.
Skyscanner
Skyscanner is a travel metasearch engine founded in 2003 and headquartered in Edinburgh, Scotland, comparing flight, hotel, and car rental prices before redirecting users to providers to book.
Skyscraper
A skyscraper is a tall, continuously occupiable multi-story building whose steel or concrete frame carries its weight, beginning with Chicago's Home Insurance Building of 1885.
SkyTeam
SkyTeam, also known as SkyTeam Alliance, is one of the three major global airline alliances, founded in 2000 by Aeromexico, Air France, Delta, and Korean Air.
SkyTrain (Vancouver)
SkyTrain is the fully automated, driverless rapid transit system serving Metro Vancouver, British Columbia, first opened in 1985 for Expo 86 and now carrying about 350,000 passengers per weekday.
Skytrax
Skytrax, formerly Inflight Research Services, is a British air transport research organization founded in London in 1989 that rates airlines and airports from 1 to 5 stars.
Skyward
Skyward is a family-owned American software company founded in Stevens Point, Wisconsin, in 1980 by Jim and Jean King, serving over 7.8 million students in more than 2,700 K-12 districts.
SkyWater Technology
SkyWater Technology is an American semiconductor foundry headquartered in Bloomington, Minnesota, founded in 2017 and acquired by IonQ in 2026; it releases the open-source SKY130 process design kit.
Skyway
A skyway is an enclosed, elevated pedestrian walkway that connects buildings above street level, protecting walkers from weather; the first modern system opened in Minneapolis in 1962.
Skyway Monte Bianco
Skyway Monte Bianco is an aerial cableway in Italy that climbs from Courmayeur to Punta Helbronner on Mont Blanc, opened in 2015 with rotating cabins.
SkyWest Airlines
SkyWest Airlines is an American regional airline headquartered in St. George, Utah. Founded in 1972, it is the largest in the United States, flying for United, Delta, American, and Alaska.
Skyworks Solutions
Skyworks Solutions is an American semiconductor company headquartered in Irvine, California, that makes radio frequency front-end chips for smartphones, with Apple as a largest customer.
SL-1
SL-1 (Stationary Low-Power Reactor Number 1) was a 3 MW experimental boiling water reactor for the US Army in Idaho, destroyed in 1961 by a power excursion and steam explosion.
Slab (car)
A slab is a customized car from Houston culture, typically an older American luxury car with protruding swanga wheels, candy paint, and a loud sound system.
Slack (software)
Slack is a cloud-based team communication and collaboration platform, begun as an internal chat tool at game studio Tiny Speck and launched publicly in February 2014, owned by Salesforce since 2021.
Slack AI
Slack AI is Salesforce's set of AI features inside Slack, including conversation summaries, AI search answers, channel recaps, and the agentic Slackbot assistant built on Claude.