All articles starting with D

Double Blind (film)

Double Blind is a 2023 Irish horror-thriller, Ian Hunt-Duffy's feature debut written by Darach McGarrigle, starring Millie Brady, Pollyanna McIntosh, and Akshay Kumar as drug-trial subjects who die if they sleep; released February 2024.

Double bond

A double bond, or double covalent bond, is a covalent bond in which two pairs of electrons are shared between two atoms, giving a bond order of 2.

Double bottom

A double bottom is a ship hull built with two layers of bottom plating, the space between serving as tanks for ballast, fuel, or fresh water.

Double buffering

Double buffering is a technique using two buffers, one read or displayed while the other is written; in graphics, it prevents flicker and tearing in animation.

Oct 21, 2026

Double chambered right ventricle

Double chambered right ventricle (DCRV), anomalous muscle bundles dividing the right ventricle into high- and low-pressure chambers, a rare congenital RVOT obstruction (0.5–2% of CHD) usually linked to VSD, often missed on echo, treated by surgical resection.

Oct 21, 2026

Double choco

Double Choco (ダブルチョコ) is a Nikoli region-dividing logic puzzle: partition a white-and-gray grid into blocks whose white and gray halves match in shape; proved NP-complete in 2022.

Double Chooz

Double Chooz was a reactor neutrino experiment in France that measured the mixing angle θ13 with two detectors at different distances from the Chooz reactors.

Double coding

Double coding is a concept in architectural theory introduced by Charles Jencks in 1977, holding that a postmodern building addresses experts and the general public at once.

Oct 10, 2026

Double coincidence of wants

Double coincidence of wants is the barter condition in which each of two traders wants what the other offers, named by W. S. Jevons in 1875.

Double consciousness

Double consciousness is W. E. B. Du Bois's concept from The Souls of Black Folk (1903): the inward twoness of African Americans seeing themselves through a white-dominated society's eyes, later extended by Fanon, Wright, and Gilroy.

Double containment

Double containment is a nuclear reactor design with two concentric walls enclosing the reactor, used in French 1300 MWe and N4 reactors and the EPR.

Double counting (proof technique)

Double counting is a proof technique in combinatorics that counts the elements of one finite set in two different ways and equates the results, yielding identities, inequalities, and nonexistence claims.

Double Decker Express

The Double Decker Express is a class of Indian Railways express trains with air-conditioned double-decker coaches seating passengers on two levels, introduced from October 2011.

Double deep Q-learning

Double deep Q-learning (Double DQN) is a reinforcement learning algorithm that reduces overestimation of action values by selecting the greedy action with the online network but evaluating it with the target network.

Double deep Q-network

The double deep Q-network, or double DQN, is a reinforcement learning algorithm that reduces overestimation of action values in tasks such as playing Atari games.

Double descent (machine learning)

Double descent is a machine learning phenomenon in which test error follows the classical U-shaped curve, peaks at the interpolation threshold, then falls again with overparameterization.

Oct 22, 2026

Double detonation

Double detonation is a proposed mechanism for Type Ia supernovae in which a helium shell detonation on a white dwarf triggers a second, core detonation, confirmed in 2025.

Double Dhamaal (डबल धमाल)

Double Dhamaal (डबल धमाल), also known as Dhamaal 2, is a 2011 Hindi Bollywood comedy directed by Indra Kumar, sequel to Dhamaal (2007), starring Sanjay Dutt, Arshad Warsi, Riteish Deshmukh, Jaaved Jaaferi, Mallika Sherawat, and Kangana Ranaut; released 24 June 2011.