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Ignition delay
Ignition delay is the time between fuel injection and the start of combustion in a diesel engine, typically about 0.5 ms, controlling noise and NOx emissions.
Ignition interlock device
An ignition interlock device is a breath-test unit installed in a vehicle that blocks the engine from starting if the driver's breath shows alcohol above a set limit.
Ignition magneto
An ignition magneto, or high-tension magneto, is a generator that fires a spark plug without a battery, once common in cars and standard on piston aircraft engines.
Ignition system
An ignition system is the assembly of components that initiates combustion in an internal combustion engine, using a high-voltage spark in petrol engines and compression ignition in diesels.
Ignition timing
Ignition timing is the crankshaft angle at which the spark plug fires in a spark-ignition engine, expressed in degrees before or after top dead center.
IGNITOR
IGNITOR is a compact, high-magnetic-field tokamak designed by MIT's Bruno Coppi to reach ignition in deuterium-tritium plasma without external heating, built as an Italian-Russian project.
Igor Babuschkin
Igor Babuschkin is a physicist-turned-AI engineer who co-founded xAI with Elon Musk in 2023, helping build Grok and the Colossus supercomputer, before founding Babuschkin Ventures and River AI.
Igor Cherepinsky
Igor Cherepinsky is a Ukrainian-born American aerospace engineer who directs Sikorsky Innovations, works on rotorcraft autonomy and flight controls, and joined the National Academy of Engineering in 2025.
Igor Emri
Igor Emri (born 1952) is a Slovenian engineer and retired Chair Professor of Mechanics at the University of Ljubljana, a pioneer of mechanics of time-dependent materials and the Knauss-Emri model.
Igor I. Sikorsky Human Powered Helicopter Competition
The Igor I. Sikorsky Human Powered Helicopter Competition, or Sikorsky Prize, was established in 1980 and required a human-powered helicopter to hover for 60 seconds above 3 meters.
Igor Pro
Igor Pro is a commercial graphing and data analysis program for scientists and engineers developed by WaveMetrics of Oregon, first released in 1989 and extensible through C/C++ modules called XOPs.
Igor Sechin (Игорь Иванович Сечин)
Igor Sechin, Igor Ivanovich Sechin, is a Russian oil executive and Putin ally who has led the state oil company Rosneft since 2012; the US sanctioned him in 2014.
Igor Sikorsky (Игорь Иванович Сикорский)
Igor Sikorsky (Игорь Иванович Сикорский), a Russian-American aviation pioneer born in Kiev in 1889, designed the first four-engine airplane and the flying boats that opened transoceanic routes.
Igrim-Serov-Nizhny Tagil Gas Pipeline
The Igrim-Serov-Nizhny Tagil Gas Pipeline is a 525 km Gazprom pipeline running from the Igrim gas fields in Western Siberia to the industrial Urals, commissioned in 1966.
Igus
Igus is a German manufacturer of motion plastics, founded by Günter Blase in 1964 in Cologne, known for energy chain cable carriers and self-lubricating polymer bearings.
IGZO backplane displays
IGZO backplane displays are LCD and OLED screens whose transistor backplane uses indium gallium zinc oxide, offering far higher mobility and much lower power draw than amorphous silicon.
IGZO thin-film transistor
An IGZO thin-film transistor is a transistor whose channel is amorphous indium gallium zinc oxide, first demonstrated in 2004 and now standard in LCD and OLED displays.
IHI Corporation
IHI Corporation, formerly Ishikawajima-Harima Heavy Industries, is a Japanese heavy-industry and engineering company headquartered in Tokyo, tracing to 1853 and known for jet engines, bridges, and ammonia co-firing.
IHS Markit
IHS Markit was a London-based provider of information and analytics for the energy, financial services, and transportation industries, formed in 2016 and absorbed into S&P Global in 2022.
IHS Towers
IHS Towers is an independent owner and operator of shared telecommunications towers, founded in Nigeria in 2001, with 37,590 towers across seven markets and an agreed 2026 acquisition by MTN Group.
III-V laser on silicon
A III-V laser on silicon is a semiconductor laser made of direct-bandgap III-V materials such as InP or GaAs, bonded onto silicon because silicon itself cannot emit light efficiently.
III-V multijunction solar cell
A III-V multijunction solar cell stacks semiconductor junctions, typically gallium indium phosphide and gallium arsenide, that split the solar spectrum to reach record efficiencies. It powers most satellites.
III-V/Si solar cell
A III-V/Si solar cell is a tandem photovoltaic device stacking a III-V semiconductor top cell, such as GaAs, on silicon to convert more sunlight than either material alone.
Ikadatsu Dam (筏津ダム)
Ikadatsu Dam is a concrete gravity dam on the Niyodo River in Kōchi Prefecture, Japan, built between 1956 and 1958 and operated by Shikoku Electric Power for hydroelectric generation.
Ikara (missile)
Ikara was an Australian-designed, ship-launched anti-submarine guided weapon that carried a homing torpedo and dropped it by parachute near a submarine, serving with the Royal Australian Navy from 1966 until 1991.
IKAROS (イカロス)
IKAROS (イカロス) is a solar sail demonstrator built by JAXA, launched on May 21, 2010, and the first spacecraft to demonstrate solar-sail propulsion and thin-film solar power generation.
Ikata Nuclear Power Plant
The Ikata Nuclear Power Plant (伊方発電所) is a nuclear power station on the Sadamisaki Peninsula in Ehime Prefecture, Japan, owned by Shikoku Electric Power and opened in 1977.
Ike Nassi
Ike Nassi is an American computer scientist and serial entrepreneur who co-created the Nassi–Shneiderman diagram, a 1973 structured alternative to the flowchart, and later held senior software roles at Apple.
IKEA
IKEA, a Swedish-founded home furnishing brand founded by 17-year-old Ingvar Kamprad in 1943, adopted flatpack furniture in 1953 and operates worldwide as a franchise system.
IKONOS
IKONOS was a commercial Earth-observation satellite, launched in September 1999 after the first spacecraft was lost, that delivered the world's first commercial one-meter satellite imagery until 2015.