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Metaplane
Metaplane is a data observability platform founded in 2019 by Kevin Hu, Guru Mahendran, and Peter Casinelli (YC Winter 2020), offering ML anomaly detection and column-level lineage; raised $22.2M and was acquired by Datadog in April 2025.
Metaprogramming
Metaprogramming is programming in which programs treat other programs, or themselves, as data, generating, analyzing, or transforming code; common forms include macros, reflection, and templates.
Metasearch engine
A metasearch engine, also called meta-search, forwards a query to multiple search engines at once and fuses the results into one list; early examples include MetaCrawler (1995) and Dogpile (1996).
Metasploit
Metasploit is an open-source penetration testing framework written in Ruby, maintained by Rapid7 since its 2009 acquisition, whose exploits, payloads, and post-exploitation modules are used by security testers and red teams.
Metastability engineering
Metastability engineering is an alloy-design strategy giving alloys metastable phases whose deformation-induced martensitic transformation raises strength and ductility, formulated for high-entropy alloys in 2016.
Metastability engineering in high-entropy alloys
Metastability engineering in high-entropy alloys is a design strategy that lowers phase stability so deformation triggers TRIP and TWIP hardening, raising strength and ductility together.
Metastable beta titanium alloys
Metastable beta titanium alloys are titanium alloys that retain the high-temperature β phase at room temperature after quenching, combining high strength, biocompatibility, and heat treatability.
Metasurface antenna
A metasurface antenna is an antenna whose radiating aperture is a metasurface, a flat sheet of subwavelength engineered elements that steers and focuses beams without phase-shifter feed networks.
Metasurface augmented-reality glasses
Metasurface augmented-reality glasses are see-through near-eye displays in which ultrathin metasurfaces replace conventional lenses and gratings, pursued as a route to lightweight, full-color AR glasses with a wide field of view.
Metasurface beam steerers
Metasurface beam steerers are flat arrays of subwavelength electromagnetic structures, or meta-atoms, that redirect beams without moving parts, serving as ultrathin alternatives to scanned mirrors and phased arrays in LiDAR, radar, and wireless links.
Metasurface vortex beam generators
Metasurface vortex beam generators are flat optical devices built from subwavelength meta-atoms that convert incident light into vortex beams carrying orbital angular momentum for communications.
Metasyntactic variable
A metasyntactic variable is a placeholder name, such as foo, bar, or baz, used in programming examples and documentation to stand for whatever entity is under discussion.
Metate
A metate is a large stone grinding surface from Mesoamerica, worked with a smaller handstone called a mano to grind maize, cacao, and other foods, still used today.
MetaTrader 4
MetaTrader 4 (MT4) is a retail electronic trading platform for forex and CFD trading, developed by MetaQuotes Software and released in 2005, with automation through its MQL4 language.
Mete Sözen
Mete Avni Sözen (1930–2018) was a Turkish-born American structural engineer at Purdue University who built one of the first earthquake simulators and pioneered drift-based seismic design of concrete buildings.
Meteor (hydrofoil)
The Meteor (Метеор) is a Soviet river passenger hydrofoil designed by Rostislav Alekseyev, built from 1961 into the 1990s, that carried over 100 passengers at 65 km/h.
Meteor (missile)
Meteor is a European long-range, radar-guided air-to-air missile developed by MBDA for six nations including the UK, France, Germany, and Sweden, entering service with Sweden in 2016.
Meteor hammer (流星锤)
The meteor hammer (流星锤), also called the flying hammer, is a Chinese flexible weapon with one or two metal hammer heads on a long rope, thrown and pulled back.
Meteor Lake
Meteor Lake, the code name for Intel's first Core Ultra mobile processors, launched in December 2023 as a tiled chip built from four chiplets joined by Foveros 3D packaging.
Meteor-M
Meteor-M (Метеор-М) is a series of Russian polar-orbiting weather and remote-sensing satellites built by VNIIEM for Roscosmos and Roshydromet, launched since 2009 from Baikonur and Vostochny to provide cloud imaging, sea-ice monitoring, and search and rescue.
Meteosat
Meteosat is a series of European geostationary meteorological satellites, first launched in 1977, that provides continuous full-disc imagery of Europe, Africa, and surrounding oceans for weather forecasting and climate monitoring.
Metering pump
A metering pump is a positive displacement pump that injects an exact, controlled volume of liquid into a process, keeping flow accurate and repeatable even as discharge pressure changes.
Methanation (hydrogen purification)
Methanation is a catalytic hydrogen purification process converting residual carbon monoxide and carbon dioxide into methane and water, used in ammonia plants and for fuel cell hydrogen.
Methane dehydroaromatization
Methane dehydroaromatization (MDA) is a non-oxidative catalytic reaction that converts methane directly into benzene and hydrogen, first reported in 1993 over a molybdenum-modified zeolite catalyst and still not commercially implemented.
Methane fermentation
Methane fermentation is anaerobic digestion in which communities of microorganisms break down manure, sewage sludge, and food waste into biogas, a methane-rich fuel mixture typically containing 55–65% methane.
Methane pyrolysis
Methane pyrolysis, also called methane decomposition or methane cracking, is a process splitting methane into hydrogen and solid carbon without CO2, yielding turquoise hydrogen at temperatures of 800 to 1600 °C.
Methane storage
Methane storage is the containment of methane, the main component of natural gas, at densities high enough for practical transport and use, most often as a vehicle fuel.
MethaneSAT
MethaneSAT is an Earth-observing satellite spectrometer launched in March 2024 by the Environmental Defense Fund to quantify methane emissions from oil and gas basins worldwide.
Methanex
Methanex Corporation is a Vancouver-based chemical company and the world's largest methanol producer, operating plants in the United States, Chile, Trinidad and Tobago, New Zealand, Egypt, and Canada.
Methanol fuel
Methanol fuel, also known as wood alcohol, is methanol (CH₃OH) used as a fuel for internal combustion engines, fuel cells, and increasingly ships, where it cuts sulfur and particulate emissions.