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SpaceX reusable launch system development program
The SpaceX reusable launch system development program is SpaceX's effort begun in the early 2010s to recover and re-fly rockets, achieving the first orbital booster landing in December 2015.
SpaceX rocket engines
SpaceX rocket engines are the liquid-propellant engines developed in-house by SpaceX to power the Falcon 1, Falcon 9, Falcon Heavy, and Starship rockets and the Dragon spacecraft.
SpaceX Starbase
SpaceX Starbase, also known as Boca Chica spaceport, is SpaceX's Starship launch, test, and manufacturing complex at Boca Chica, Texas, incorporated as a city in May 2025.
SpaceX Starbase, Louisiana
SpaceX Starbase, Louisiana, is a planned commercial spaceport announced in 2026 on 125,000 acres of Pecan Island in Vermilion Parish, backed by a $100 billion investment.
SpaceX Starfall
SpaceX Starfall, also called Project Starfall, is SpaceX's uncrewed, mass-producible reentry capsule for carrying payloads to orbit and returning them to Earth, first flown in 2026.
SpaceX Starshield
SpaceX Starshield is SpaceX's government-oriented satellite business built on Starlink technology, offering Earth observation, communications, and hosted payloads, including a classified reconnaissance constellation for the National Reconnaissance Office.
SpaceX Starship
SpaceX Starship, also called the Starship and Super Heavy, is a fully reusable two-stage super-heavy-lift rocket developed by SpaceX at Starbase, Texas, and selected by NASA for the Artemis lunar landings.
SpaceX Starship design history
The SpaceX Starship design history traces the fully reusable Super Heavy booster and Starship spacecraft from 2012 Mars studies through the ITS, BFR, and V3 vehicles.
spaCy
spaCy is an open-source natural language processing library for Python and Cython, first released in 2015 by Explosion, with pretrained pipelines supporting tagging, parsing, and named entity recognition in over 70 languages.
SPAD (railway)
A signal passed at danger (SPAD) is an event in which a train passes a stop signal without authority, prompting automatic train protection systems to reduce the risk.
Spade
A spade is a digging tool with a flat blade and straight, sharp edge for cutting soil and roots, distinct from the shovel, which lifts loose material.
Spadina Expressway
The Spadina Expressway was a proposed north–south freeway in Toronto, canceled by Ontario Premier Bill Davis in 1971 after public opposition; only the William R. Allen Road was built.
Spaghetti code
Spaghetti code, also called spaghetti programming, is pejorative term for tangled source code that is difficult to understand and modify, originally tied to overuse of goto.
Spaghetti junction
Spaghetti Junction is the popular name for the Gravelly Hill Interchange, the five-level junction where the M6 meets the A38(M) in Birmingham, England, opened in 1972.
Spain AESA UAS regulation
Spain's regulation of civil drones is administered by the state aviation safety agency AESA, resting since 31 December 2020 on EU Regulations 2019/945 and 2019/947, supplemented by national decree 517/2024.
Spalling
Spalling is the breaking off of layers or fragments from a material's surface, occurring in fire-exposed concrete, corroded reinforced concrete, freeze–thaw pavements, rock, and bearing rails.
Spamming
Spamming, also called electronic spamming, is the practice of sending unsolicited bulk email to many recipients without their permission, usually through spambots running on botnets.
Span.IO, Inc.
Span.IO, Inc. is a San Francisco technology company founded in 2018 by former Tesla Energy executive Arch Rao that makes smart electrical panels and electric vehicle chargers for homes.
Spanair
Spanair was a Spanish airline founded by SAS in 1986, based in Barcelona; once Spain's second largest airline, it ceased operations in January 2012 after bankruptcy.
Spanair Flight 5022
Spanair Flight 5022 was a scheduled domestic flight from Madrid to Gran Canaria that crashed on takeoff at Madrid-Barajas on 20 August 2008, killing 154 of the 172 people aboard.
Spandex
Spandex, also called elastane or Lycra, is a synthetic elastic fiber invented by DuPont chemist Joseph Shivers in 1958 that stretches up to 500% and recovers its shape.
Spanish early-modern municipal aqueducts
Spanish early-modern municipal aqueducts were gravity-fed water-supply systems built from the sixteenth century, including Teruel's Los Arcos, Plasencia's San Antón, and Madrid's viajes de agua.
Spanish ship Nuestra Señora de la Santísima Trinidad
Nuestra Señora de la Santísima Trinidad was a Spanish first-rate ship of the line, built at Havana in 1769 and the only four-decked warship of its era.
Spanning tree coverage
Spanning tree coverage (STC) is a robot coverage path planning method that traces a loop around a spanning tree of grid cells, introduced by Gabriely and Rimon in 2001.
Spanning Tree Protocol
The Spanning Tree Protocol (STP) is an IEEE 802.1D network protocol that lets Ethernet switches block redundant links to prevent loops, invented by Radia Perlman in 1985.
SPARC
SPARC (Scalable Processor ARChitecture) is a RISC instruction set architecture formulated at Sun Microsystems in 1985, known for register windows and licensed royalty free by SPARC International since 1989.
SPARC (robotics partnership)
SPARC, the Partnership for Robotics in Europe, was a public-private partnership on robotics between the European Commission and euRobotics under Horizon 2020, running from 2014 to 2020.
SPARC first-plasma campaign
The SPARC first-plasma campaign is the initial operating phase of SPARC, a compact high-field tokamak by Commonwealth Fusion Systems in Devens, Massachusetts, aiming for net fusion energy gain.
SPARC64 V
SPARC64 V is a 64-bit SPARC V9 enterprise server microprocessor developed by Fujitsu and announced in 2002 as the engine of its PRIMEPOWER UNIX servers.
SPARCstation 1
The SPARCstation 1, code named Campus and sold as the Sun 4/60, was a desktop UNIX workstation introduced by Sun Microsystems in April 1989 as the first SPARCstation.