All articles starting with D

Double Vision (Foreigner album)

Double Vision (1978) is the second studio album by British-American rock band Foreigner, released on Atlantic. Produced by Keith Olsen with Mick Jones and Ian McDonald, it reached number 3 on the Billboard 200 behind the singles Hot Blooded, Double Vision, and Blue Morning, Blue Day, and was the last album by the original six-member lineup.

Double white dwarf

A double white dwarf is a binary star system where both stars are white dwarfs, whose mergers may trigger Type Ia supernovae and emit gravitational waves.

Double wishbone suspension

Double wishbone suspension, also called double A-arm or SLA suspension, is an independent suspension using two wishbone-shaped control arms per wheel, first used in the 1930s by Citroën.

Double XL

Double XL (डबल एक्सएल) is a 2022 Hindi comedy-drama directed by Satramm Ramani, starring Sonakshi Sinha and Huma Qureshi as plus-size women chasing dreams in London; released 4 November 2022, poorly reviewed, streamed on Netflix.

Double-A (baseball)

Double-A (AA) is the second-highest level of affiliated Minor League Baseball, below Triple-A. Known as the biggest test for prospects, with median player age 24 and only 3.5% with MLB experience.

Double-balloon endoscopy

Double-balloon endoscopy is an endoscopic technique in which two inflatable balloons grip the intestinal wall, allowing deep small-bowel examination and treatment without surgery, first reported in 2001.

Oct 21, 2026

Double-Balloon Enteroscopy

Double-balloon enteroscopy (DBE), invented by Hironori Yamamoto and first reported in 2001, is a balloon-assisted deep enteroscopy technique using an endoscope and overtube with two balloons; distinct from single-balloon and spiral enteroscopy.

Double-barreled shotgun

A double-barreled shotgun is a smoothbore long gun with two barrels arranged side by side or over and under, typically break action, dominant for roughly a century and a half.

Double-barrelled name

A double-barrelled name combines two surnames into one, hyphenated or spaced. Formed by marriage, inheritance, or parental choice; historically British upper-class, now widespread in Britain, Ireland, and former British-settled countries, distinct from Spanish two-surname systems.

Double-bundle anterior cruciate ligament reconstruction

Double-bundle anterior cruciate ligament reconstruction is a knee surgery that rebuilds a torn ACL with two tendon grafts, one for each functional bundle, to restore rotational stability.

Double-clad fiber

A double-clad fiber is an optical fiber with a small signal core and a larger inner cladding that guides multimode pump light, the basis of cladding-pumped high-power fiber lasers and amplifiers.

Double-crank linkage

A double-crank linkage, also called a drag-link mechanism, is a planar four-bar linkage whose two frame-hinged links rotate fully, converting one continuous rotation into another, non-uniform one.

Double-Cross System

The Double-Cross System (XX system) was MI5's WWII counter-intelligence operation that turned captured German spies into over 120 double agents, including GARBO (Juan Pujol) and TATE, whose false reports under Operation Fortitude pinned German divisions at the Pas-de-Calais during D-Day.

Double-crystal monochromator

A double-crystal monochromator is an X-ray optical device in which two crystals diffract a beam twice to select a narrow, tunable energy band, standard at hard X-ray synchrotron beamlines.

Double-curvature arch dam

A double-curvature arch dam is a concrete arch dam curved both horizontally and vertically into a bowl shape, which lets designers build it thinner than other concrete dams.

Double-deck aircraft

A double-deck aircraft is an airliner with two passenger decks; only the Boeing 747, with a partial upper deck, and the Airbus A380 entered wide service.

Double-decker bus

A double-decker bus is a bus with two passenger decks, seating 60 to 120 people. The red London double-decker is among the most recognizable vehicles in the world.

Double-diffusive convection

Double-diffusive convection, first called thermohaline convection, arises when a fluid's density depends on two components, like heat and salt, that diffuse at very different rates.

Double-double

Double-double: basketball stat of 10+ in two of five categories (points, rebounds, assists, steals, blocks) in one game; term from 1985; Chamberlain holds 968 career and 227-game streak records.

Double-dummy technique

The double-dummy technique is a blinding method for randomized trials where treatments differ in appearance, so each participant takes an active drug and a matching placebo.

Double-elimination tournament

Double-elimination tournament, also double knockout: a bracket format where two losses eliminate a participant. Winners and losers brackets converge in a grand final, with about 2n−2 matches; common in esports and martial arts.

Double-ended queue

A double-ended queue, abbreviated deque, is a data structure in which elements can be added, removed, and examined at both the front and the back.

Double-entry bookkeeping

Double-entry bookkeeping is an accounting method in which every transaction is recorded with equal debits and credits across at least two accounts, first printed by Luca Pacioli in 1494.

Double-enveloping worm gear

A double-enveloping worm gear, also called globoidal or double-throated gearing, is a worm drive in which the hourglass-shaped worm and wheel wrap around each other for high torque capacity.

Double-headed eagle

Double-headed eagle: ancient Anatolian and Mesopotamian motif, Byzantine imperial and Palaiologos emblem, later arms of the Holy Roman Empire, Russia, Serbia, Albania, and Orthodox churches.

Double-headed serpent

The double-headed serpent is an Aztec or Mixtec turquoise mosaic pectoral made in Mexico between about 1400 and 1521, one of the best-known Mesoamerican objects in the British Museum.

Double-negative acoustic metamaterial

A double-negative acoustic metamaterial is an engineered material in which both the effective mass density and bulk modulus are negative, first demonstrated theoretically by Li and Chan in 2004.

Double-network hydrogel

A double-network hydrogel is a soft material of two interpenetrating polymer networks, one brittle and one stretchable, giving gels with about 90% water and strength far beyond ordinary hydrogels.

Double-precision floating-point format

Double-precision floating-point format, known as binary64, is the 64-bit number format defined by IEEE 754 that offers about 15 to 17 significant decimal digits of precision.