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Scunthorpe problem
Scunthorpe problem: false positives in profanity and spam filters that block innocent text containing obscene substrings, named after the 1996 AOL block of Scunthorpe, England residents; mitigated by word-boundary matching, whitelists, and human review.
Scuttling
Scuttling is the deliberate sinking of a ship or boat by its own crew, owner, or government, by opening seacocks, flooding compartments, or cutting holes in the hull.
SD card
The SD card (Secure Digital) is a removable flash memory card format announced in 1999 by Panasonic, SanDisk, and Toshiba, made in full-size and microSD forms.
SD Express
SD Express is a high-speed interface for SD and microSD cards, defined by the SD Association in 2018, carrying data over PCIe with NVMe at up to 3940 MB/s.
SD Gundam G Generation Eternal
SD Gundam G Generation Eternal (SDガンダム ジージェネレーション エターナル) is a free-to-play tactical strategy game for iOS and Android, released worldwide by Bandai Namco Entertainment in 2025.
SD-WAN
SD-WAN (software-defined WAN) is a networking approach, first named in 2014, that centralizes control of traffic between enterprise sites and steers each application across links like MPLS, broadband, and cellular.
Sd.Kfz. 234
The Sd.Kfz. 234 was a family of German eight-wheeled heavy armored cars of the Second World War, produced from late 1943 to 1945 in four variants distinguished mainly by their armament.
Sd.Kfz. 251
The Sd.Kfz. 251 (Sonderkraftfahrzeug 251), nicknamed the Hanomag, was a German half-track armored personnel carrier of World War II that carried panzer grenadiers alongside tanks.
SDEdit
SDEdit (Stochastic Differential Editing) is a diffusion-based image editing method that adds noise to a guided input image, then denoises it into a realistic result.
SDF (file format)
SDF, or Structure-Data File, is a plain-text chemical file format developed by MDL in the 1980s that stores molecular structures together with tagged data fields.
SDR-4X
The SDR-4X was a prototype small biped entertainment robot announced by Sony in 2002, the fourth model in its SDR humanoid series and the direct predecessor of QRIO.
SDS Sigma 7
The SDS Sigma 7 was a 32-bit word-oriented mainframe announced by Scientific Data Systems in 1966, the largest Sigma model at introduction and an IBM System/360 competitor.
SDXL
SDXL (Stable Diffusion XL) is a text-to-image latent diffusion model developed by Stability AI, whose 3-billion-parameter base model was released openly in July 2023 under the OpenRAIL++-M license.
SDXL Turbo
SDXL Turbo is a distilled version of Stability AI's SDXL 1.0 text-to-image model, released in November 2023, that generates a 512×512 image from a text prompt in one step.
Se‐Hee Lee
Se-Hee Lee is a battery materials scientist and Professor of Mechanical Engineering at the University of Colorado Boulder, and a co-founder of the solid-state battery company Solid Power.
Sea Baby (Морський малюк)
Sea Baby (Морський малюк) is a Ukrainian unmanned surface vehicle packed with explosives, operated by the Security Service of Ukraine and known for striking the Kerch Bridge in 2023.
Sea captain
A sea captain, formally the master of the ship, is the person in overall command of a merchant vessel, responsible for its safe operation, crew, passengers, and cargo.
Sea clutter
Sea clutter is the unwanted radar echo returned from the sea surface, scattered by waves, ripples, and spray, that makes detecting ships and small boats harder for maritime radar.
Sea Dart
Sea Dart (GWS-30) is a British naval surface-to-air missile system developed by Hawker Siddeley Dynamics, carried on Royal Navy destroyers and carriers from 1973 to 2012, with kills in the Falklands War.
Sea Dragon (rocket)
Sea Dragon was a 1962 design study by Robert Truax at Aerojet-General, under NASA contract, for a two-stage, sea-launched super heavy-lift rocket; it was never built.
Sea Hawk (USV)
Sea Hawk is a U.S. Navy medium displacement unmanned surface vessel built by Leidos and delivered in April 2021 as a sister ship to Sea Hunter.
Sea Hunter
Sea Hunter is a 132-foot (40-meter) unmanned trimaran developed for DARPA's anti-submarine warfare program, launched in 2016 and now the US Navy's testbed for medium unmanned surface vessels.
Sea kayak
A sea kayak is a closed-deck paddle craft for seas, large lakes, and exposed coastlines, distinguished by watertight bulkheads, generous cargo capacity, and rudders or skegs.
Sea Launch
Sea Launch was a commercial launch venture, founded in 1995 by US, Russian, Ukrainian, and Norwegian partners, that launched satellites from a floating platform on the Pacific equator.
Sea Link (interconnector)
Sea Link is a proposed 2 GW HVDC electricity transmission link between Suffolk and Kent in England, developed by National Grid to reinforce the grid between East Anglia and the South East.
Sea Lion Field
Sea Lion Field is an offshore oil field in the North Falkland Basin about 220 kilometers north of the Falkland Islands, discovered in 2010 by Rockhopper Exploration.
Sea Machines Robotics, Inc.
Sea Machines Robotics is a Boston-based marine technology company, founded in 2015, that builds autonomy, remote helm control, and perception systems for commercial and defense vessels.
Sea Shadow (IX-529)
Sea Shadow (IX-529) was an experimental stealth ship built by Lockheed for the United States Navy to test radar signature reduction and the SWATH hull form, revealed in 1993.
Sea shanty
A sea shanty, also spelled chantey or chanty, is a work song sung by sailors to coordinate group labor aboard merchant sailing ships, flourishing in the 1800s.
Sea Star (satellite)
SeaStar, also designated OrbView-2, was an American commercial Earth-observation satellite operated by Orbital Sciences Corporation and launched in 1997, carrying SeaWiFS, a radiometer measuring ocean color for NASA research.