A triad may refer to: 3 (number) ;Music: Triad (music), three-note chord consisting of a "root" note together with the third and fifth above it Triad (album), 1976 album by Spontaneous Combustion "Triad" (Pitchshifter song), song by Industrial metal band Pitchshifter from their 1993 album Desensitized "Triad" (David Crosby song), 1967 song about a ménage à trois "Triad", song by progressive rock band Tool from their 2001 album Lateralus ;Medieval literature: Welsh Triads, collections of medieval Welsh legend and history Triads of Ireland, triplet proverbs and aphorisms ;Fiction: The Triad (Charmed ), group of three powerful demons in the television series Charmed Triad (superhero), alias of fictional DC Comics super hero Triplicate Girl Triad (Battlestar Galactica ), ball sport in the television series Battlestar Galactica (1978-1980) Triad (Battlestar Galactica ), card game in the television series Battlestar Galactica (2003-2009) Triiad, alien species from the television series Hypernauts ;Medicine: Triad (anatomy), structure in skeletal muscles, formed by a T tubule surrounded by sarcoplasmic reticulum Catalytic triad, biochemical term for three amino acid residues found within some proteases Currarino triad, three malformations with a genetic link Portal triad, distinctive arrangement in the liver Unhappy triad, tearing of one or both of the cruciate ligaments, along with collateral ligament damage and meniscal tear(s) Group of three signs or symptoms for diagnosis of various conditions: * Beck's triad (cardiology), for cardiac tamponade * Beck's cognitive triad, for depression * Charcot's triad 1, for multiple sclerosis or * Charcot's triad 2, for ascending cholangitis * Cushing's triad, for head injuries * Dieulafoy's triad, for acute appendicitis * Female athlete triad, low energy availability in female athletes * Hutchinson's triad, congenital syphilis * Meckler's triad, for Boerhaave syndrome * Virchow's triad, for venous thrombosis * Whipple's triad, for hypoglycemia * MacDonald triad, for anti-social personality disorder ;Computing: Triad (computers), group of three phosphor dots used in some computer monitors Triad C64, Commodore 64 cracking group Rise of the Triad , computer game TriadCity, MUD with literary themes ;Commerce: Triad Advertising, Sri Lankan advertising agency Triad Broadcasting, US radio station operator Triad Hospitals, former hospital operator based in Plano, Texas Triad Racing Technologies, former NASCAR team Triad Securities Triad demand, UK electrical power demand measurement Triad, collective name coined by Kenichi Ohmae for the three developed markets of Japan, North America and Western Europe ;Organizations: Lexington Triad Miami Triad Syracuse Triad, three women's sororities founded at Syracuse University Triad (underground societies), Chinese organized-crime societies Triad Theater, in New York City Triad High School, disambiguation Union Triad ;Other: Triad (Greek philosophy), Pythagorean symbol for the number three Triple deity, three deities commonly associated together Triad (relationship), relationship between three people Triad (sociology), group of three people as a unit of study Nuclear triad, nuclear arsenal with three components HMS Triad (N53), T-class submarine of the UK Royal Navy Piedmont Triad, region of North Carolina, USA Triad (environmental science), management system for environmental cleanup Dark triad, group of three undesirable personality traits

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See also

• Triadi, village in Thessaloniki, Greece
• Triadic, disambiguation
• Triadica, plant genus of the family Euphorbiaceae
• Triads, Yardies and Onion Bhajees , 2003 British film directed by Sarjit Bains