Dual
Dual or Duals may refer to: == Paired/two things == Dual (mathematics), a notion of paired concepts that mirror one another Dual (category theory), a formalization of mathematical duality see more cases in Category:Duality (mathematics) Dual number, a number system used in automatic differentiation Dual (grammatical number), a grammatical category used in some languages Dual county, a Gaelic games county which competes in both Gaelic football and hurling Dual diagnosis, a psychiatric diagnosis of co-occurrence of substance abuse and a mental problem Dual fertilization, simultaneous application of a P-type and N-type fertilizer Dual impedance, electrical circuits that are the dual of each other Dual SIM cellphone supporting use of two SIMs Aerochute International Dual a two-seat Australian powered parachute design == Acronyms and other uses == Dual (brand), a manufacturer of Hifi equipment DUAL (cognitive architecture), an artificial intelligence design model DUAL algorithm, or diffusing update algorithm, used to update Internet protocol routing tables Dual language, alternative spelling of the Australian Aboriginal Dhuwal language DUAL table, a special one-row and one-column database table Dual-Ghia, US-brand of luxury-car of the late 1950s == Media == Dual (2008 film), a 2008 western drama film Dual (2022 film), a 2022 science fiction thriller film "Dual" (Heroes), an episode of Heroes Dual! Parallel Trouble Adventure, an anime series Dual (album), an album of traditional Scottish and Irish music recorded by Éamonn Doorley, Muireann Nic Amhlaoibh, Julie Fowlis and Ross Martin, released 2008 Dual (EP), a 2013 EP by Sampha Duals, an album by U2 The Duals, American duo Dual (brand), brand name of audio and video electronics.