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 theories
 * Dual (grammatical number), a grammatical category used in some languages
 * Dual county, a Gaelic games county which 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