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Small sword
The small sword, or smallsword, is a light thrusting civilian sword of the 17th and 18th centuries, descended from the rapier and worn as part of a gentleman's dress.
Small waterplane area twin hull
A small waterplane area twin hull (SWATH) is a twin-hull ship with two submerged hulls joined by struts to an upper platform, staying stable in rough seas.
Small-signal model
A small-signal model is a linear approximation of a nonlinear circuit or device, valid for small signals and used in amplifier, RF, and control design.
Small-signal stability
Small-signal stability is the ability of a power system to maintain synchronism under small disturbances like load changes, analyzed by linearizing the system around an operating point.
Smalley Steel Ring Company
Smalley Steel Ring Company is an American manufacturer of retaining rings, wave springs, and constant section rings, founded in 1918 and headquartered in Lake Zurich, Illinois.
Smalls Lighthouse
Smalls Lighthouse is an active Trinity House lighthouse standing on the Smalls rocks in the Irish Sea about 21 miles west of St David's Head, Pembrokeshire, Wales.
Smalltalk
Smalltalk is a family of purely object-oriented programming languages created at Xerox PARC between 1970 and 1980, known for message passing and live image-based programming.
Smart (marque)
Smart, an acronym of Swatch, Mercedes, and Art, is a city-car marque created in the 1990s by Swatch and Daimler-Benz and owned since 2019 by Mercedes-Benz and Geely.
Smart 5
The Smart 5, sold in China as the smart精灵#5, is a battery-electric mid-size SUV from smart, the Mercedes-Benz and Geely joint venture, launched in 2024.
Smart 6
The Smart #6, sold in China as the 精灵#6, is a plug-in hybrid fastback sedan from smart, the Mercedes-Benz and Geely joint venture, launched in China in June 2026.
Smart antenna
A smart antenna is an antenna system, usually an array, with digital signal processing that steers beams toward users and forms nulls against interference, used in 5G and radar.
Smart Battery System
Smart Battery System (SBS) is a set of specifications for rechargeable battery packs that report their own state and predictions to a host, developed by Duracell and Intel in 1995.
Smart bed
A smart bed is a bed or mattress system with built-in sensors that passively track heart rate, breathing, and movement, and may adjust temperature or firmness automatically.
Smart card
A smart card, also called a chip card, is a credit-card-sized plastic card with an embedded chip used for secure payments, identification, and access control.
Smart city
A smart city, also known as an intelligent city or U-city, is an urban area that uses data and sensors to improve public services, traffic, and energy use.
Smart contract
A smart contract is a program stored on a blockchain that executes automatically when called; the concept was introduced by Nick Szabo in 1994 and deployed at scale on Ethereum from 2015.
Smart device
A smart device, also called smart technology, is a physical object embedded with sensors, processors, and network connectivity, spanning smartphones, wearables, smart speakers, and appliances.
Smart Forfour
The Smart Forfour is a four-seat, four-door city car sold by smart in two generations, from 2004 to 2006 and again from 2014 to 2021.
Smart Fortwo
The Smart Fortwo, also sold as the City Coupé, is a two-seat microcar with a rear engine and visible Tridion steel safety cell, made from 1998 to 2024.
Smart glass
Smart glass, also called switchable glass or smart windows, is window glass that alternates between clear and tinted states on demand, cutting cooling and lighting energy in buildings.
Smart grid
The smart grid, also called grid modernization, is an electricity network upgraded with digital technology and two-way communication so utilities and customers can exchange information and manage energy use.
Smart material
A smart material, also called an intelligent material, changes its properties, such as shape or color, in response to a stimulus like heat, pressure, or an electric field.
Smart meter
A smart meter, also called a smart energy meter, is an electronic utility meter that records electricity use in intervals and sends readings to the supplier automatically.
Smart plug
A smart plug is a socket adapter placed between a wall outlet and an appliance that allows remote on/off control, scheduling, and often energy monitoring through a phone app.
Smart radio environment
A smart radio environment is a wireless communication environment made software-reconfigurable, with surfaces on walls and buildings that actively shape how radio waves reflect and travel.
Smart Roadster
The Smart Roadster is a two-seat, rear-mid-engine targa roadster built by Smart in Hambach, France, from 2003 to November 2005; 43,091 were sold before its cancellation.
Smart speaker
A smart speaker is a wireless speaker and voice command device that activates with a wake word, performs tasks over the internet, and controls other home devices.
Smart switch
A smart switch is a wall-mounted electrical switch replacing a standard mechanical one, adding wireless lighting control by app, voice, timer, or automation over protocols such as Wi-Fi and Zigbee.
Smart Tissue Autonomous Robot
The Smart Tissue Autonomous Robot (STAR) is an experimental surgical robot developed at Johns Hopkins University that performs autonomous soft-tissue suturing; in 2022 it performed the first autonomous laparoscopic surgery in a live animal.
SMART Tunnel
The SMART Tunnel (Stormwater Management and Road Tunnel) is a 9.7 km tunnel beneath Kuala Lumpur whose central 3 km section doubles as a double-deck motorway, the first tunnel to combine the two functions.