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Spire of Dublin
The Spire of Dublin, officially the Monument of Light, is a 120 m stainless steel monument on O'Connell Street, Dublin, built on the site of Nelson's Pillar and completed in 2003.
Spirent Communications
Spirent Communications was a British provider of automated test and assurance solutions for networks, cybersecurity, and positioning, headquartered in Crawley, England, until Keysight acquired it in 2025.
Spirit (rover)
Spirit, also known as MER-A, was a NASA Mars rover that landed in Gusev Crater in 2004, planned for 90 days but operating for over six years.
Spirit AeroSystems
Spirit AeroSystems was an American aerostructures manufacturer in Wichita, Kansas, created from Boeing in 2005 and dismantled in 2025, when Boeing reacquired its operations and Airbus took the rest.
Spirit Airlines
Spirit Airlines was an American ultra-low-cost carrier based in Dania Beach, Florida, operating from 1992 until it shut down in May 2026 after a fuel-price shock.
Spirit and Opportunity
Spirit and Opportunity were twin six-wheeled solar-powered NASA rovers that landed on Mars in January 2004, designed for 90 days but operating until 2010 and 2018.
Spirit of Ecstasy
The Spirit of Ecstasy, also known as the Flying Lady, is the hood mascot of Rolls-Royce cars, designed by Charles Robinson Sykes and registered in 1911.
Spirit of Mojave
Spirit of Mojave, formerly Virgin Orbit's Cosmic Girl, is a modified Boeing 747-400 that Stratolaunch bought in 2023 and uses to air-launch the reusable Talon-A hypersonic test vehicle over the Pacific.
Spirit of Progress
The Spirit of Progress was an express passenger train run by Victorian Railways from 1937 between Melbourne and Albury, Australia's first completely streamlined, air-conditioned, all-steel train.
Spirit of St. Louis
The Spirit of St. Louis is the Ryan NYP monoplane flown by Charles Lindbergh on the first solo nonstop flight across the Atlantic, from New York to Paris in May 1927.
Spiro (company)
Spiro is an African electric mobility company, founded in 2019, that sells electric motorcycles and operates the continent's largest battery-swapping network across seven countries, with over 100,000 bikes by mid-2026.
Spiro-OMeTAD
Spiro-OMeTAD, first described in 1998, is an amorphous organic p-type semiconductor used as the benchmark hole-transporting material in perovskite and solid-state dye-sensitized solar cells, enabling certified devices above 26% efficiency.
Spiroid gear
The Spiroid gear is a skew-axis speed-reduction gear set, invented by Oliver E. Saari at Illinois Tool Works in the 1950s, with a tapered worm pinion meshing a spiral-toothed face gear.
Spite house
A spite house is a building constructed or modified to annoy a neighbor or municipality, often blocking light or a view, at cost to its own occupant.
Spittelau incineration plant
The Spittelau incineration plant (Müllverbrennungsanlage Spittelau) is a Vienna waste-to-energy plant run by Wien Energie, known for its colorful Hundertwasser redesign after a 1987 fire.
Spittoon
A spittoon, also called a cuspidor, is a receptacle for catching spit and chewing-tobacco juice, once common in American saloons until anti-tuberculosis campaigns in the late 1800s.
SPLADE
SPLADE, short for Sparse Lexical and Expansion Model, is a family of neural retrieval models from NAVER Labs Europe that expands and weights bag-of-words representations for search.
Splash screen
A splash screen, also known as a welcome screen, is an initial screen displayed by software while it loads, typically showing a logo, version information, credits, or a copyright notice.
Splashdown
Splashdown is the landing of a spacecraft on water at the end of a spaceflight, the standard recovery method for American crewed capsules since Mercury.
Splay tree
A splay tree, also called a self-adjusting binary search tree, is a search tree that splays each accessed node to the root, giving amortized O(log n) operations.
Spline interpolation
Spline interpolation, or interpolating spline, fits a low-degree piecewise polynomial, usually cubic, through data points with smooth joins at the knots, avoiding the wild oscillations of single high-degree polynomials; I. J. Schoenberg introduced it in 1946.
Split air conditioner
A split air conditioner is a cooling and often heating system split between a quiet indoor unit and an outdoor compressor, including ductless mini-splits and multi-splits.
Split brain (computing)
Split brain in computing is a cluster failure state in which a network partition gives nodes conflicting membership views, risking data corruption; quorum and I/O fencing prevent it.
Split federated learning
Split federated learning (SFL) is a distributed machine learning method that splits a neural network between clients and a server, introduced by Chandra Thapa and colleagues in 2020.
Split learning
Split learning is a distributed machine learning technique, developed at the MIT Media Lab in 2018, that partitions a neural network between clients and a server.
Split Rock Lighthouse
Split Rock Lighthouse is a decommissioned lighthouse on a 130-foot cliff of Lake Superior's North Shore near Two Harbors, Minnesota, built in 1910 and opened to visitors as a historic site.
Split-cycle engine
A split-cycle engine is a reciprocating internal combustion engine that divides the four strokes between two paired cylinders joined by a crossover passage; designs date to 1872 but none are in series production.
Split-level home
A split-level home, also called a split-level or bi-level home, is a single-family house whose floors are staggered at half-story intervals, common in American postwar suburbs from the mid-1950s through the 1970s.
Split-phase electric power
Split-phase electric power is a single-phase AC distribution arrangement in which a center-tapped transformer winding delivers 120/240 VAC over three wires, the standard residential supply in North America.
Split-system air conditioner
A split-system air conditioner cools (and often heats) through separate outdoor and indoor units linked by refrigerant piping rather than ductwork, avoiding the roughly 30% energy losses of ducted air.