Dual

Dual or Duals may refer to:

• Dual (mathematics), a notion of paired concepts that mirror one another
• Dual (category theory), a formalization of mathematical duality
• see more cases in Duality theories
• 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

• 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

• 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.

• Duality (disambiguation)
• Duel (disambiguation), a homonym
• Double (disambiguation)
• Duo (disambiguation)
• Pair (disambiguation)
• Twin (disambiguation)