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Spencer House
Spencer House is a Grade I listed eighteenth-century town house at 27 St James's Place, London, built between 1756 and 1766 for John Spencer, later First Earl Spencer.
Spencer repeating rifle
The Spencer repeating rifle, patented by Christopher Spencer in 1860, was the first repeating rifle to use metallic cartridges; its carbine became a leading Union cavalry arm of the Civil War.
Spencer Shops
Spencer Shops was the Southern Railway's principal locomotive repair and maintenance complex at Spencer, North Carolina, built from 1896 and now home to the North Carolina Transportation Museum.
Spencer's method
Spencer's method, published by E. Spencer in Géotechnique in 1967, is a limit equilibrium method of slices for computing a slope's factor of safety against failure.
Spent fuel pool
A spent fuel pool is a water-filled basin at a nuclear power plant where irradiated fuel assemblies removed from the reactor are stored underwater for cooling, shielding, and contamination control.
Spent nuclear fuel
Spent nuclear fuel is the intensely radioactive fuel removed from a nuclear reactor after it can no longer sustain a chain reaction, stored in pools and dry casks.
Speyer Cathedral
Speyer Cathedral (Speyerer Dom), formally the Cathedral of St. Mary and St. Stephen, is a Romanesque imperial basilica in Speyer, Germany, founded by Emperor Konrad II in 1030.
SPG-9
The SPG-9, Russian СПГ-9 and nicknamed Kopye, is a Soviet 73 mm tripod-mounted recoilless gun adopted in 1962 to replace the B-10, still widely used for fire support.
SPH Engineering
SPH Engineering is a Latvian drone technology company founded in 2013 by Alexey Dobrovolskiy, known for UgCS flight-planning software, SkyHub onboard computers, and Drone Show Software.
Sphere decoding
Sphere decoding (SD) is a tree-search algorithm for maximum-likelihood MIMO detection that searches only lattice points inside a hypersphere around the received vector, avoiding exhaustive enumeration.
Sphere shaping precoding
Sphere shaping precoding is transmit-side signal processing that picks the codeword whose energy lies inside a sphere, pre-canceling interference in multiuser MIMO downlinks and in probabilistic amplitude shaping.
SPHERES
SPHERES is a testbed of three bowling-ball-sized free-flying satellites developed by MIT that has operated inside the International Space Station since 2006, demonstrating formation flying and autonomous docking in microgravity.
SPHEREx
SPHEREx is a NASA astrophysics space telescope launched in March 2025 that is conducting the first all-sky near-infrared spectral survey, imaging the entire sky in 102 infrared colors.
Spherical robot (manipulator)
A spherical robot, also called a polar robot, is an industrial manipulator with two rotary joints and one linear joint, used for welding and die casting.
Spherical wrist
A spherical wrist is a robot wrist mechanism whose three revolute joint axes intersect at a single point, the wrist center, as in the Stanford manipulator.
Sphero (toy)
Sphero is a smartphone-controlled spherical robot toy first launched in 2011 by Orbotix, a Boulder, Colorado company that later took the Sphero name and expanded into educational robotics.
Spherulite
A spherulite is a spherically symmetric aggregate of fibrillar crystals that grow radially from a common nucleation center, formed when polymers and minerals crystallize from viscous melts at large undercooling.
Sphinx Systems
Sphinx Systems, also known as Sphinx Systems Limited, was a Swiss manufacturer of hand-fitted semi-automatic pistols such as the Sphinx 3000, founded in 1876 and bankrupt by 2015.
SPICE
SPICE, short for Simulation Program with Integrated Circuit Emphasis, is an electronic circuit simulation program developed at UC Berkeley, first released in 1972 and standard for analog design.
Spice (bomb)
Spice is a family of Israeli precision-guided glide bombs produced by Rafael Advanced Defense Systems, a name often confused in reporting with the American GBU-39 Small Diameter Bomb.
SPICE simulation
SPICE simulation, short for Simulation Program with Integrated Circuit Emphasis, numerically solves a circuit's nonlinear equations from a netlist, becoming the de facto standard of analog design.
SPICE toolkit
The SPICE toolkit, named for Spacecraft, Planet, Instrument, C-matrix, Events, is a free software library and data system from NASA's NAIF for computing observation geometry in planetary missions.
SpiceJet
SpiceJet, also known as Royal Airways, is an Indian low-cost airline founded in 2005 and headquartered in Gurugram, operating domestic and international passenger flights and SpiceXpress cargo services.
SPIDAR
SPIDAR (Space Interface Device for Artificial Reality) is a string-based haptic interface family developed at Tokyo Institute of Technology, using motor-driven strings to track the hand and apply force feedback in virtual environments.
Spider monkey optimization
Spider monkey optimization (SMO) is a swarm intelligence metaheuristic for continuous numerical optimization, introduced by Jagdish Chand Bansal and colleagues in 2014, modeling the fission–fusion foraging of spider monkeys.
Spidercam
Spidercam is a cable-suspended camera system developed in Austria by Jens C. Peters, first shown on television in 2005 and owned by Ross Video since 2022.
Spike (missile)
Spike, also known as Euro-Spike or Tamuz, is an Israeli family of electro-optically guided anti-tank missiles developed by Rafael after the 1973 Yom Kippur War, used by more than 40 countries.
Spike Firefly
The Spike Firefly is a man-portable miniature loitering munition developed by Rafael and Israel's Ministry of Defense for urban combat; the IDF ordered it in 2020 as the Maoz.
Spiking neural network
A spiking neural network (SNN) is a neural network in which neurons communicate by discrete all-or-nothing pulses called spikes, often called a third generation of neural networks.
Spillover in flexible structure control
Spillover in flexible structure control is when a controller designed for a few vibration modes of a flexible structure excites neglected higher modes, possibly causing instability.