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Siemens Desiro
The Siemens Desiro, or Desiro, is a family of electric and diesel multiple-unit trains for regional, commuter, and suburban service, sold by Siemens Mobility.
Siemens Digital Industries
Siemens Digital Industries is the automation and industrial software division of Siemens AG, selling SIMATIC PLCs and lifecycle software including NX and Teamcenter, with about 68,000 employees.
Siemens Digital Industries Software
Siemens Digital Industries Software is a Siemens AG division providing design, manufacturing, and product lifecycle management software, including NX and Teamcenter, built from the 2007 UGS acquisition.
Siemens E40 AG-V1
The Siemens E40 AG-V1, later marketed as the E40AC, is a six-axle electric heavy-haul locomotive built by Siemens Mobility in Munich for the coal railways of Queensland, Australia.
Siemens EDA
Siemens EDA, formed from Mentor Graphics, acquired by Siemens in 2017 and rebranded in 2021, is the third-ranked EDA vendor behind Synopsys and Cadence, known for its Calibre verification software.
Siemens eHighway
Siemens eHighway is an electrified road system in which an overhead contact line powers hybrid electric trucks, demonstrated in Sweden and the US and field-tested on three German corridors.
Siemens Energy
Siemens Energy is a German energy technology company headquartered in Munich, spun off from Siemens AG in 2020, producing gas turbines, grid equipment, and Siemens Gamesa wind turbines.
Siemens Gamesa
Siemens Gamesa is a Spanish-German wind turbine manufacturer formed in 2017 from the merger of Siemens Wind Power and Gamesa, wholly owned by Siemens Energy since 2023.
Siemens Healthineers
Siemens Healthineers is a German medical technology company spun out of Siemens AG and listed on the Frankfurt Stock Exchange since 2018, providing diagnostic imaging, laboratory diagnostics, and cancer care.
Siemens Mobility
Siemens Mobility is the rail transport business of Siemens AG, covering rolling stock, infrastructure, and software, and the world's third-largest rolling stock maker as of 2023.
Siemens NX
Siemens NX, formerly Unigraphics, is a CAD/CAM/CAE software suite from Siemens Digital Industries Software, built on the Parasolid kernel and acquired with UGS Corp. in 2007.
Siemens Plant Simulation
Siemens Plant Simulation is discrete-event simulation software for modeling and optimizing production systems and material flow, sold by Siemens Digital Industries Software as part of the Tecnomatix portfolio.
Siemens process
The Siemens process is a chemical vapor deposition method for producing hyperpure polysilicon, developed by Siemens in the mid-1950s and still holding about 85 percent of the polysilicon market in 2025.
Siemens SD-100 and SD-160
The Siemens SD-100 and SD-160 are closely related articulated high-floor light rail vehicles built by Siemens from 1994, the SD-160 using AC motors; Denver operates the largest fleet.
Siemens syngo
Siemens syngo is a family of medical imaging software from Siemens Healthineers, introduced in 1999 as a common user interface and anchored by the syngo.via reading platform.
Siemens TCS (traffic control system)
Siemens TCS is a traffic control system family from Siemens Mobility and Yunex Traffic whose UTC platforms run the SCOOT adaptive signal algorithm, used across some 5,500 London junctions.
Siemens Vectouro
Siemens Vectouro, also known as Siemens Viaggio Next Level, is a family of Siemens Mobility passenger coaches for cross-border European long-distance travel, launched in 2024 and reaching 230 km/h.
Siemens Velaro
The Siemens Velaro, known simply as Velaro, is a family of high-speed electric trains built by Siemens Mobility and derived from Germany's ICE 3, in service since 2000.
Siemens Venture
Siemens Venture is a family of single-level intercity passenger rail cars built by Siemens Mobility in Sacramento for North American operators like Brightline, Amtrak, and VIA Rail.
Siemens Xcelerator
Siemens Xcelerator is the open digital business platform of Siemens AG, launched in 2022, combining a curated portfolio of IoT-enabled hardware, software, and digital services with a partner ecosystem and marketplace.
Siemens-Schuckert Orenstein & Koppel
Siemens-Schuckert Orenstein & Koppel, or Siemens O&K, are German-built electric subway cars that served the Buenos Aires Underground from 1934 until 2016, running on every line except B.
Siemens–Duewag U2
The Siemens–Duewag U2 is a six-axle articulated light rail vehicle built from 1968 to 1990 for Frankfurt's Stadtbahn, which launched the first modern light rail systems in North America.
Siena Cathedral
Siena Cathedral (Duomo di Siena) is a Romanesque-Gothic cathedral in Siena, Tuscany, banded in white and black marble and dedicated to the Assumption of Mary.
Siena Palazzo Pubblico
The Siena Palazzo Pubblico, also called Palazzo Comunale, is Siena's Gothic town hall on the Piazza del Campo, built between 1297 and 1310 and still the seat of municipal government.
Sierra
Sierra is a San Francisco company founded in 2024 by Bret Taylor and Clay Bavor that builds AI customer-service agents for enterprises, charging by outcome rather than by seat.
Sierra Chata Oil and Gas Field
The Sierra Chata Oil and Gas Field is a natural gas field in Argentina's Neuquén Basin, discovered in 1993 and operated by Pampa Energía since 2018.
Sierra funding round
The Sierra funding round of May 2026 raised $950 million for AI customer-service startup Sierra Technologies, led by Tiger Global and GV at a $15 billion valuation.
Sierra Nevada Brewing Company
Sierra Nevada Brewing Company is an American craft brewery founded in Chico, California, in 1979–1980 by Ken Grossman and Paul Camusi, known for its Cascade-hopped Pale Ale.
Sierra Nevada Corporation
Sierra Nevada Corporation (SNC) is a privately held American aerospace and national security company, founded in 1963 and owned by Eren and Fatih Ozmen since 1994.
Sierra Space
Sierra Space is an American commercial aerospace and defense company in Louisville, Colorado, spun off from Sierra Nevada Corporation in 2021; it develops the Dream Chaser spaceplane and LIFE habitats.