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S-transform
The S-transform, or Stockwell transform, is a linear time-frequency transform with a Gaussian window that narrows at high frequencies, introduced in 1996 and used in power quality and seismic analysis.
S-Video
S-Video, also called Y/C or separate video, is an analog standard-definition video interface carrying luminance and chrominance separately for a sharper picture than composite; it appeared with S-VHS around 1987.
S. Donald Stookey
S. Donald Stookey (Stanley Donald Stookey, 1915–2014) was an American materials scientist at Corning who invented glass-ceramics, the material behind CorningWare cookware, and photochromic glass for eyeglasses.
S. Edward Law
S. Edward Law is an American agricultural and biological engineer, D.W. Brooks Distinguished Professor Emeritus at the University of Georgia, elected to the National Academy of Engineering in 1996.
S. George Bankoff
S. George Bankoff (1921–2011) was an American chemical engineer and Northwestern University professor known for two-phase flow and heat transfer research in nuclear reactor safety.
S. Julio Friedmann
S. Julio Friedmann is an American geoscientist and carbon management expert known as a "carbon wrangler," who works on carbon removal, carbon capture, hydrogen, and industrial decarbonization.
S. Nurzhanov field
The S. Nurzhanov field (С. Нұржанов кен орны) is an onshore oil and gas field in western Kazakhstan's Atyrau Region, operated by Embamunaigas, a KazMunayGas subsidiary, and producing since 1963.
S. Rao Kosaraju
S. Rao Kosaraju, born 1943, is an Indian-American theoretical computer scientist who spent 50 years at Johns Hopkins University and is known for Kosaraju's algorithm.
S. Ravi P. Silva
S. Ravi P. Silva is a materials scientist who directs the Advanced Technology Institute at the University of Surrey and works on carbon nanomaterials and solar cells.
S. Somanath
Sreedhara Panicker Somanath is an Indian aerospace engineer who served as the tenth Chairman of ISRO from 2022 to 2025, overseeing the Chandrayaan-3 lunar landing.
S. W. Herwald
Seymour W. Herwald (1917–1998) was an American engineer and research manager at Westinghouse Electric known for servomechanisms and analog computers, elected to the National Academy of Engineering in 1967.
S.A. Agulhas II
S.A. Agulhas II is a South African icebreaking vessel for polar supply and scientific research, launched in Finland in 2011 to support Antarctic and sub-Antarctic stations.
S.V. Sreenivasan
S.V. Sreenivasan, also known as Sidlgata Sreenivasan, is an American nanotechnologist at the University of Texas at Austin, elected to the National Academy of Engineering in 2021.
S/MIME
S/MIME (Secure/Multipurpose Internet Mail Extensions) is a standard for securing email with digital signatures and encryption, defined by the IETF in RFC 8551 and RFC 8550.
S/PDIF
S/PDIF (Sony/Philips Digital Interconnect Format) is a consumer digital audio interconnect that carries two channels of PCM or compressed surround over coaxial or optical links.
S&box
S&box is a game engine and creation platform by Facepunch Studios, built on Valve's Source 2 and positioned as the successor to Garry's Mod, released on Steam in 2026.
S&P Global Corporate Sustainability Assessment
The S&P Global Corporate Sustainability Assessment (CSA) is an annual ESG evaluation run by S&P Global since 1999, scoring companies from 0 to 100 relative to industry peers.
s1 (AI model)
s1, also called s1-32B, is an open-source AI reasoning model created in January 2025 by researchers at Stanford University, the University of Washington, and the Allen Institute for AI.
S3 (programming language)
S3 is a programming language developed by the British computer maker ICL for its 2900 series mainframes, where it implemented the VME/B operating system; it is a development of ALGOL 68.
S3 ViRGE
The S3 ViRGE, short for Video and Rendering Graphics Engine, was a 2D/3D graphics chipset S3 introduced in 1995, sold heavily to OEMs despite its slow 3D.
S8000 Banderol (Бандероль)
The S8000 Banderol, also known as Бандероль, is a Russian low-cost subsonic cruise missile developed by Kronstadt JSC and used against Ukraine since spring 2025.
SA Power Networks
SA Power Networks, formerly ETSA Utilities and renamed in 2012, is the monopoly electricity distributor for South Australia, serving about 900,000 customers through more than 88,000 kilometers of powerlines.
SA-1B
SA-1B, or Segment Anything 1 Billion, is an image segmentation dataset released by Meta AI in 2023, containing 11 million photos and 1.1 billion masks.
SA-SAGD
SA-SAGD (solvent-assisted steam-assisted gravity drainage) is a bitumen recovery process for oil sands that co-injects a hydrocarbon solvent with steam, cutting steam demand and emissions.
SA80
The SA80, whose rifle version is the L85 Individual Weapon, is a British bullpup assault weapon that has been the British Army's standard rifle since 1985.
Saab 105
The Saab 105, known in Swedish service as the Sk 60, is a Swedish twin-engine jet trainer and light attack aircraft that first flew in 1963.
Saab 2000
The Saab 2000 is a Swedish 50-seat regional turboprop airliner developed from the Saab 340 to compete with regional jets on speed; 63 were built before production ended in 1999.
SAAB 21
The Saab 21, designated J 21, was a Swedish single-seat fighter and attack aircraft of twin-boom pusher design, the first Swedish aircraft fitted with an ejection seat.
Saab 29 Tunnan
The Saab 29 Tunnan, nicknamed "the Barrel," was a Swedish single-seat jet fighter and the first Western European fighter built with a swept wing, first flown in 1948.
Saab 340
The Saab 340 is a twin-engine turboprop regional airliner for 34 passengers, developed by Saab-Scania and Fairchild Industries, first flown in 1983 and built until 1999, with 459 produced.