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Service network design
Service network design (SND) is an operations research method that decides which freight services to offer, at what frequency, and how demand flows over them in transportation systems.
Service pistol
A service pistol is a semi-automatic pistol or revolver issued as the standard personal defense sidearm of a nation's military or police, with dedicated military pistols dating to the 1800s.
Service rifle
A service rifle is the standard firearm issued to a nation's regular infantry; in the United States, the 5.56mm M16 and its variants have been standard since the 1960s.
Service set (802.11 network)
A service set in IEEE 802.11 is a group of wireless stations forming one logical Wi-Fi network, identified by an SSID and organized as a BSS, IBSS, ESS, or mesh.
Service Worker
A service worker is an event-driven JavaScript script registered by a web page that intercepts network requests, serves cached content offline, and powers progressive web apps and push notifications.
Service-based architecture
Service-based architecture (SBA) is the design of the 5G core network in which network functions communicate over common HTTP-based service interfaces, standardized by 3GPP in Release 15.
Service-level agreement
A service-level agreement (SLA) is a contract defining the level of service a provider must deliver, how it is measured, and the remedies when missed.
Service-oriented architecture
Service-oriented architecture (SOA), or service-oriented computing, is a software design paradigm, emerging in the late 1990s, that builds applications from reusable services communicating through well-defined interfaces.
ServiceMax
ServiceMax is a cloud-based field service management software platform, built on Salesforce and owned by PTC since 2023, that manages installation, maintenance, and repair of complex equipment.
ServiceNow
ServiceNow, formerly Glidesoft, is an American software company in Santa Clara, California, founded by Fred Luddy in 2004, known for its cloud platform that automates IT service management and business workflows.
Services Selection Board
The Services Selection Board (SSB) is the Indian Ministry of Defence organization that assesses candidates for commission as officers in the Army, Navy, and Air Force over five days.
ServiceTitan
ServiceTitan is an American software company in Glendale, California, whose cloud platform manages scheduling, dispatching, invoicing, and more for trades contractors; it went public in 2024.
Servitization
Servitization is the strategy by which manufacturing firms shift from selling products alone to selling bundles of goods, services, and support, a term coined in 1988.
Servo control
Servo control is the method by which a radio-controlled servo converts a command signal into a held shaft position, using pulses of about 1 to 2 ms.
Servo valve
A servo valve is an electrohydraulic valve that converts an electrical input signal into precise, stepless hydraulic flow or pressure, used in aircraft flight controls, test rigs, and steel mills.
Servomanipulator
A servomanipulator is an electrically controlled master–slave manipulator with force reflection, letting operators remotely handle hazardous materials in hot cells; the first was built at Argonne in 1954.
Servomechanism
A servomechanism, or servo, is a feedback control system whose output is mechanical motion, typically the position or speed of a shaft, driven by an error signal.
Servomotor
A servomotor is a rotary or linear actuator for precise control of position, velocity, and acceleration, used in a closed-loop servo system with a feedback encoder.
Servotronix
Servotronix (高创), formally Servotronix Motion Control Ltd., is an Israeli automation and motion control company founded in 1987, headquartered in Petah Tikva and controlled since 2017 by Midea Group.
SES (satellite constellation)
The SES satellite constellation is the multi-orbit fleet of communications satellites operated by SES S.A., a Luxembourg satellite operator, pairing geostationary satellites with the O3b medium Earth orbit system.
SES AI
SES AI Corporation, NYSE: SES, is a Woburn, Massachusetts company founded in 2012 that makes AI-enhanced lithium-metal and lithium-ion batteries for EVs, drones, and energy storage.
Sesame CSM
Sesame CSM (Conversational Speech Model) is a family of speech-native conversational speech models by Sesame, first released in March 2025 after its viral Maya voice demo.
Session (computer networking)
In computer networking, a session, or communication session, is shared state between two or more endpoints that persists across exchanged messages, formalized as OSI layer 5.
Session Description Protocol
The Session Description Protocol (SDP) is an IETF text format describing multimedia sessions, conveying media streams, addresses, and timing; its current specification, RFC 8866, was published in 2021.
Session hijacking
Session hijacking, also called cookie hijacking or sidejacking, is an attack in which a stolen session cookie lets an attacker impersonate a logged-in user without knowing their credentials.
Session Initiation Protocol
The Session Initiation Protocol (SIP) is an application-layer signaling protocol defined by the IETF for establishing, modifying, and terminating multimedia sessions, and the predominant VoIP signaling protocol.
Session layer
The session layer is layer 5 of the seven-layer OSI model, managing and synchronizing dialogue between applications through token control and synchronization points, defined by ITU-T X.225.
Sessions House
Sessions House: English quarter sessions courthouse buildings; the best known is the Grade I listed 1676-8 Sessions House on George Row, Northampton, attributed to Henry Bell, with plaster ceilings by Edward Goudge; other examples at Clerkenwell, Lincoln, Boston, and Spalding.
Sesterce
Sesterce is a French AI-infrastructure company founded in 2018 and based in Marseille that operates a GPU cloud and builds liquid-cooled AI factory data centers.
Set (abstract data type)
A set, also known as a set data structure, is an abstract data type that stores unique elements with no duplicates, supporting add, remove, membership, union, intersection, and difference.