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Stack-oriented programming
Stack-oriented programming is a style of programming in which operations take their arguments from a stack rather than named variables; its best-known language is Forth.
Stacked CMOS image sensor
A stacked CMOS image sensor bonds a light-capturing pixel chip and a signal-processing circuit chip on top of each other, introduced by Sony in 2012.
Stacked ensemble learning
Stacked ensemble learning, or stacking, is a machine learning method in which a second-level meta-learner is trained on the predictions of several base models, introduced by David Wolpert in 1992.
Stacked ensemble model
Stacked ensemble model (stacking) is a supervised machine learning method that trains a second-level meta-model on the predictions of diverse base models to achieve higher accuracy.
Stacked generalization
Stacked generalization, or stacking, is an ensemble method in machine learning that trains a meta-learner on the outputs of base models, proposed by David Wolpert in 1992.
Stacker crane
A stacker crane is a rail-mounted machine that automatically stores and retrieves pallets or totes in a single warehouse rack aisle, defining the crane-based AS/RS.
Stad Amsterdam
Stad Amsterdam is a three-masted steel-hulled clipper built in Amsterdam between 1997 and 2000, serving as the official flagship of the city and the SAIL Amsterdam festival.
Stad Ship Tunnel
The Stad Ship Tunnel (Stad skipstunnel) is a planned 1,700-meter ship tunnel through Norway's Stad Peninsula, approved in 2021 as the world's first full-scale ship tunnel.
Stade nuclear power plant
The Stade nuclear power plant (Kernkraftwerk Stade, KKS) was a pressurized water reactor on the Elbe near Stade, Germany, operating from 1972 until its shutdown in 2003.
Stadler FLIRT
The Stadler FLIRT, short for Fast Light Innovative Regional Train, is a family of low-floor regional trains built by Stadler Rail since 2004, with about 2,700 sold.
Stadler METRO
The Stadler METRO is a family of lightweight electric metro trains built by Swiss manufacturer Stadler Rail, ordered for the Tyne and Wear Metro, Glasgow Subway, and Merseyrail.
Stadler Rail
Stadler Rail is a Swiss rolling stock manufacturer headquartered in Bussnang, founded in 1942, building locomotives, high-speed, regional, and underground trains, tram-trains, trams, and rack railways.
Stadler SMILE
The Stadler SMILE, also known as the Giruno, is a high-speed electric multiple unit built by Stadler Rail for Swiss Federal Railways, reaching 250 km/h and in service since 2019.
Stadtbahn
Stadtbahn (German for "city railway") is urban rail transit in German-speaking countries, developed from tramways, with vehicles running in tunnels downtown and on street or regional tracks outside it.
Stadtwerke München
Stadtwerke München (SWM) is the municipal utilities company of Munich, Germany, supplying electricity, gas, water, heating, transport, and telecommunications; it was formally constituted on 1 April 1939.
STag
STag is a square fiducial marker system for camera pose estimation, proposed in 2017, that minimizes pose jitter by refining the homography with a circular border.
Stage separation
Stage separation is the flight event in which a spent rocket stage is detached from the launch vehicle so the continuing stage can carry on to orbit.
Stagecoach
Stagecoach is one of the United Kingdom's largest bus and coach operators, founded in Perth, Scotland, in 1980 by Brian Souter and Ann Gloag and owned since 2022 by a DWS-managed infrastructure fund.
Stagecoach Group
Stagecoach Group, also known as Stagecoach plc, is a British bus and coach operator founded in 1980 by Brian Souter and Ann Gloag, headquartered in Perth, Scotland.
Staged combustion cycle
The staged combustion cycle is a closed liquid rocket engine cycle in which preburner gas drives the turbopumps and is then burned again in the main chamber.
Staged Z-pinch
The staged Z-pinch is a magneto-inertial fusion concept introduced in 1995, in which a pulsed current drives a plasma liner onto deuterium fuel; experiments have produced over 10 billion neutrons.
Staggered formation
Staggered formation is a motorcycle group-riding arrangement where riders alternate between the left and right thirds of one lane, offset diagonally behind the rider ahead.
Stahl (company)
Stahl is a Dutch specialty chemicals company founded in 1930 that makes coatings and surface treatments for leather, textiles, and packaging. Henkel acquired it in 2026 for €2.1 billion.
Stahlhelm
The Stahlhelm (German for "steel helmet") is the German military steel combat helmet introduced in 1916 to protect troops against shell splinters, becoming an enduring symbol of twentieth-century German history.
Stainless steel
Stainless steel, also called inox steel, is a corrosion-resistant iron-based alloy with at least 10.5% chromium, first made by Harry Brearley in Sheffield, England, in 1913.
Staircase
A staircase is a series of steps, usually with landings and handrails, built to let people move between the levels of a building, governed by building codes.
Staircase FEC codes
Staircase FEC codes are forward-error-correcting codes for optical fiber transmission that couple short BCH block codes into a continuous structure, proposed in 2012 and standardized in ITU-T G.709.2.
Staircase lock
A staircase lock is a set of canal locks built directly on top of one another, sharing gates so no pound separates them, allowing much steeper flights of locks.
Stairs
Stairs, also called stairways or flights of stairs, are a series of steps that permit passage between floors of a building, built since about 6000 BC.
Stalag 17
Stalag 17 (1953) is Billy Wilder's POW comedy-drama, adapted from the 1951 Broadway play by Bevan and Trzcinski, starring William Holden as suspected informer J.J. Sefton; Holden won the Best Actor Oscar.