Triad

A triad, in simplest terms, is defined as a "group of three".

Biology, anatomy, and medicine

• Catalytic triad, biochemical term for three amino acid residues found within some proteases
• Currarino triad, three malformations with a genetic link
• Triadica, plant genus of the family Euphorbiaceae
• Portal triad, distinctive arrangement in the liver
• Triad (anatomy), structure in skeletal muscles, formed by a T tubule surrounded by sarcoplasmic reticulum
• Unhappy triad, tearing of one or both of the cruciate ligaments, along with collateral ligament damage and meniscal tear(s)
• A group of three signs or symptoms for diagnosis of various conditions:
  • Beck's triad (cardiology), for cardiac tamponade
  • Charcot's neurologic triad, for multiple sclerosis
  • Charcot's cholangitis triad, 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
  • Samter's Triad, also known as Aspirin-induced asthma, also known as:
    • Acetylsalicylic acid Triad
    • Francis' Triad
    • Triad Asthma
    • Widal's Triad

Psychology and sociology

• Beck's cognitive triad, types of negative thought present in depression
• Dark triad, group of three undesirable personality traits
• MacDonald triad, group of sociopathic infantile traits for anti-social personality disorder
• Triad (relationship), relationship between three people
• Triad (sociology), group of three people as a unit of study

Politics and economics

• Nuclear triad, the strategy of splitting a nation's nuclear deterrent into land, sea, and air systems
• The economic "triad" of Japan and Southeast Asia, North America, and Western Europe in the theory of triadization

Philosophy and religion

• Thesis, antithesis, synthesis, the triad of German philosophy
• trichotomy (philosophy), e.g., Peirce's triads
• Triple deity, three deities commonly associated together

Science and technology

• Triad (computers), group of three phosphor dots used in some computer monitors
• Triad demand, UK electrical power demand measurement
• Triad (environmental science), management system for environmental cleanup
• HMS Triad (N53), T-class submarine of the UK Royal Navy
• Dobereiner's Triads, groups of three similar chemical elements

Places

• Piedmont Triad, region of North Carolina, USA
• Triadi, village in Thessaloniki, Greece

Organizations

• Triad (underground society), Chinese organized-crime societies
• Lexington Triad, a group of three fraternities founded at colleges in Lexington, Virginia
• Miami Triad, a group of three fraternities founded at Miami University in Oxford, Ohio
• Syracuse Triad, three women's sororities founded at Syracuse University
• Triad Broadcasting, US radio station operator
• Triad High School (disambiguation)
• Triad Hospitals, former hospital operator based in Plano, Texas
• Triad Racing Technologies, former NASCAR team
• Triad Securities, a broker-dealer
• Triad Strategies, American lobbying firm
• Triad Theater, in New York City
• Union Triad, a group of three fraternities founded at Union College in Schenectady, New York

Entertainment

Music

• Triad (music), three-note chord consisting of a "root" note together with the third and fifth above it
• Triad (band), a Swedish musical band from the late 1980s
• "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

Television

• The Triad (Charmed), group of three powerful demons who are the opposites of the Charmed One's in the sense of good and evil in the television series Charmed
• Triiad, alien species from the television series Hypernauts

Video games

• Rise of the Triad, computer game
• TriadCity, MUD with literary themes

Literature

• Welsh Triads, collections of medieval Welsh legend and history
• Triads of Ireland, triplet proverbs and aphorisms
• The three parts of the Pindaric ode: the strophe, the antistrophe, and the epode

Other

• Triad (superhero), alias of fictional DC Comics super hero Triplicate Girl
• Triads, Yardies and Onion Bhajees, 2003 British film directed by Sarjit Bains

See also

• 3 (number)
• 3 (disambiguation)
• Triadic (disambiguation)
• Trichotomy (mathematics)
• Trichotomy (philosophy)
• Third (disambiguation)
• Trio (disambiguation)
• Trinity
• Triplet (disambiguation)
• Triple (disambiguation)
• Triumvirate
• Troika (disambiguation)