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Dubins path
A Dubins path is the shortest curve between two oriented points under a curvature bound and forward-only motion, described by Lester Dubins in 1957 for path planning.
Dublin Airport
Dublin Airport, also known as Aerfort Bhaile Átha Cliath, is Ireland's main international airport, 10 km north of Dublin. Opened in 1940, it handled a record 36.4 million passengers in 2025.
Dublin Castle
Dublin Castle is a government complex and major state ceremonial site in central Dublin, built from 1204 on the orders of King John of England on a former Viking settlement site.
Dublin Core
Dublin Core is a metadata standard of fifteen descriptive elements, such as Title, Creator, and Date, developed at a 1995 workshop in Dublin, Ohio and standardized as ISO 15836.
Dubrovnik Airport
Dubrovnik Airport, also known as Čilipi Airport and officially Ruđer Bošković Airport since 2023, serves Dubrovnik, Croatia, from near the village of Čilipi. Opened in 1962, it is the country's third-busiest airport.
Dubsmash
Dubsmash was a short-form video app launched in Berlin in 2014 for lip-syncing over audio clips; Reddit acquired it in 2020 and shut it down in 2022.
Ducati
Ducati is an Italian motorcycle manufacturer based in Bologna, founded in 1926, known for sport bikes with desmodromic valve gear and a racing program with MotoGP and Superbike titles.
Ducati 1199
The Ducati 1199 Panigale is a 1199 cc sport motorcycle produced by Ducati from 2012, the first superbike with an aluminum monocoque chassis and a name alongside its capacity number.
Ducati Monster
The Ducati Monster is a naked roadster motorcycle built by Ducati in Borgo Panigale, Italy, since 1993, designed by Miguel Galluzzi and Ducati's best-selling model.
Ducati Panigale V4
The Ducati Panigale V4 is a superbike motorcycle built by Ducati in Bologna and the first production Ducati to use a four-cylinder engine, derived from its MotoGP racer.
Duck Creek Technologies
Duck Creek Technologies is an American software company, founded in 2000 and based in Boston, that provides cloud-based core systems for the property and casualty insurance industry.
Duck curve
The duck curve is the graph of a power grid's daily net load after solar generation is subtracted, sagging at midday and climbing steeply in the evening.
Duck typing
Duck typing is a programming style, common in dynamic languages like Python and Ruby, that judges an object by the methods it has rather than its declared type.
DuckDB
DuckDB is an open-source, in-process analytical (OLAP) SQL database system created by Mark Raasveldt and Hannes Mühleisen at CWI Amsterdam as the analytical counterpart to SQLite.
DuckDuckGo
DuckDuckGo is an independent internet privacy company based in Paoli, Pennsylvania, founded by Gabriel Weinberg in 2008, known for a tracking-free search engine and a privacy browser.
DuckLake
DuckLake is an open lakehouse format from the DuckDB team (DuckLabs), storing metadata in a SQL catalog database (SQLite, PostgreSQL, MySQL, DuckDB) and data in Iceberg-compatible Parquet files. Launched May 2025, v1.0 April 2026, MIT-licensed.
Ducommun
Ducommun Incorporated is an American aerospace and defense manufacturer headquartered in Costa Mesa, California. Founded as a Los Angeles hardware store in 1849, it is the oldest company in California.
Duct tape
Duct tape is a pressure-sensitive cloth tape with a polyethylene backing, fabric scrim, and rubber-based adhesive, invented during World War II and used for temporary repairs, though it is discouraged on actual ductwork.
Ductile fracture
Ductile fracture is the failure mode of a metal preceded by substantial plastic deformation, proceeding by nucleation, growth, and coalescence of microscopic voids inside the material.
Ductile iron
Ductile iron, also known as nodular or spheroidal graphite iron, is a cast iron with spherical graphite nodules that give it useful strength, developed by Keith Millis in 1943.
Ductile machining
Ductile machining is a precision cutting method in which brittle materials such as glass, silicon, and ceramics are removed by plastic flow rather than fracture, leaving crack-free surfaces.
Ductless mini-split heat pump
A ductless mini-split heat pump is an air-source heating and cooling system linking an outdoor unit to wall- or ceiling-mounted indoor units by refrigerant lines, with no ductwork.
Dude Wipes
Dude Wipes is an American brand of flushable moist wipes for men, founded by four friends in Chicago in 2011 and backed by Mark Cuban on Shark Tank.
Dudgeon Offshore Wind Farm
The Dudgeon Offshore Wind Farm is a 402 MW wind farm in the North Sea off Norfolk, England, opened in 2017 and operated by Equinor.
Dudhichua Coal Mine
Dudhichua Coal Mine, also known as the Dudhichua Opencast Project, is a large mechanized opencast coal mine in the Singrauli coalfield of Madhya Pradesh, India, run by Northern Coalfields Limited.
Dudley A. Saville
Dudley A. Saville (1933–2006) was an American chemical engineer at Princeton University who pioneered electrohydrodynamics and electric-field assembly of colloidal particles, elected to the National Academy of Engineering in 2003.
Dudley Maurice Newitt
Dudley Maurice Newitt (1894–1980) was a British chemical engineer who led high-pressure research at Imperial College London and directed sabotage research for the Interservices Research Bureau during World War II.
Dudley S. Childress
Dudley S. Childress (1934–2014) was an American biomedical engineer at Northwestern University who pioneered prosthetics, created the first commercial proportional myoelectric prosthesis, and originated the roll-over shape concept.
Dudley Tunnel
Dudley Tunnel is a canal tunnel in Dudley, England, begun in 1775 to serve limestone mines and now the second longest navigable canal tunnel in the UK.
Dueling network architectures
The dueling network architecture is a deep reinforcement learning design introduced by Google DeepMind in 2015, splitting a Q-network into value and advantage streams that are combined into action values.