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Massage chair
A massage chair is a motorized reclining chair that massages the back, limbs, and feet with rollers, airbags, and heat, first mass-produced in Japan in 1954.
Massage gun
A massage gun is a handheld percussive therapy device delivering rapid pulses to muscle tissue, with the category created by the Theragun, launched commercially in 2016.
Massey Energy
Massey Energy Company was an American bituminous coal producer headquartered in Richmond, Virginia, best known for the 2010 Upper Big Branch mine explosion that killed 29 miners.
Massey Ferguson
Massey Ferguson is an agricultural machinery brand formed from the 1953 merger of Massey-Harris and the Ferguson companies, owned by AGCO, spanning tractors of about 25 to 425 hp.
Massey-Harris
Massey-Harris was a Canadian agricultural machinery manufacturer formed in 1891 by merging Massey Manufacturing and A. Harris and Son, known for its self-propelled combines; it merged with Harry Ferguson in 1953 to become Massey-Ferguson.
Massimo Silvio Morbidelli
Massimo Silvio Morbidelli is an Italian chemical engineer, professor emeritus at ETH Zurich, elected to the US National Academy of Engineering in 2026 for continuous biopharmaceutical processes.
MASSIVE (dataset)
MASSIVE is a dataset of one million realistic, parallel, labeled virtual assistant utterances in 51 languages, created by Amazon researchers and released publicly for multilingual NLU evaluation.
Massive machine-type communications
Massive machine-type communications (mMTC) is one of the three main 5G usage scenarios, covering huge numbers of connected devices that send small, delay-tolerant amounts of data.
Massive MIMO
Massive MIMO (massive multiple-input multiple-output) is a radio access technology in which a base station uses 64 or more antennas to serve multiple users simultaneously, underpinning 5G capacity gains.
Massoud T. Simnad
Massoud T. Simnad (1921-2002) was an Iranian-born American engineer and materials scientist who spent 25 years at General Atomics on nuclear fuels, reactors, and fusion materials, later teaching at UC San Diego.
MasSpec Pen
The MasSpec Pen is a handheld, biocompatible sampling device coupled to a mass spectrometer that distinguishes normal from cancerous tissue within roughly 10 to 20 seconds without cutting the sample.
Mast (sailing)
A mast is the vertical spar on a sailing vessel that carries the sails, held upright by standing rigging and built from timber, aluminum, or carbon fiber.
Mast radiator
A mast radiator is a radio antenna where the steel tower itself serves as the radiating element, the standard transmitting antenna for AM broadcast stations.
MAST Upgrade
MAST Upgrade is the United Kingdom's flagship spherical tokamak fusion experiment at Culham, Oxfordshire, which began operating in October 2020 and tests the Super-X divertor exhaust system.
Mastcam
Mastcam (Mast Camera) is the pair of mast-mounted color cameras that serve as the main scientific eyes of NASA's Curiosity rover, which landed in Gale crater in 2012.
Mastcam-Z
Mastcam-Z, short for Mast Camera Zoom, is a pair of zoomable, multispectral, stereoscopic cameras on NASA's Perseverance Mars rover, which landed in Jezero crater in February 2021.
MasTec
MasTec, Inc. is a North American infrastructure engineering and construction company headquartered in Coral Gables, Florida, formed in 1994 and listed on the NYSE, with 2024 revenue of $12.3 billion.
Master boot record
The master boot record (MBR), or partition sector, is the first 512-byte sector of a partitioned disk, holding boot code and a table of up to four partitions.
Master controller (teleoperation)
A master controller is the operator-side input device of a master-slave teleoperation system, capturing the operator's hand motions and, in force-reflecting designs, pushing back with forces felt at the slave.
Master cylinder
The master cylinder, also called the master brake cylinder, is a hydraulic pump operated by the brake pedal that sends fluid pressure to the wheel brakes.
Master data management
Master data management (MDM) is a technology-enabled business discipline in which business and IT create accurate, consistent master data records, such as customers and products, shared across enterprise systems.
Master File Table
The master file table (MFT) is the core metadata structure of the NTFS file system, storing the information required to retrieve every file on an NTFS partition.
Master of Engineering
The Master of Engineering (M.Eng., M.Engr.) is an engineering degree, taken as a four-year integrated undergraduate degree in the UK or a one-to-two-year postgraduate degree in the US, Canada, Australia, and New Zealand.
Master theorem (analysis of algorithms)
The master theorem is a result in the analysis of algorithms that gives the asymptotic running time of many divide-and-conquer recurrences, first published by Bentley, Haken, and Saxe in 1980.
Master–slave manipulator
A master–slave manipulator is a pair of linked robot arms where the operator moves a master arm and a slave arm copies it, used in nuclear hot cells.
MasterBrand
MasterBrand, Inc. is an American cabinet manufacturer and the largest maker of residential cabinets in North America, spun off from Fortune Brands Home & Security in 2022.
Mastercam
Mastercam is a computer-aided manufacturing software suite from CNC Software of Tolland, Connecticut, that generates toolpaths and control code for CNC milling, turning, and wire EDM machines.
MasterFormat
MasterFormat is a standardized list of numbers and titles for organizing construction specifications and project manuals, published jointly by CSI in the United States and CSC in Canada.
Mastic asphalt
Mastic asphalt (German Gussasphalt, French asphalte coulé) is a voidless asphalt mixture, impermeable and durable, that is poured hot without compaction; it has covered German Autobahns since the 1960s.
Mastodon (social network)
Mastodon is a free, open-source, decentralized microblogging platform started in 2016 by Eugen Rochko, in which independent servers federate over ActivityPub to form the fediverse.