Complex commonly refers to:

  • Complexity, the behaviour of a system whose components interact in multiple ways so possible interactions are difficult to describe
  • Complex system, a system composed of many components which may interact with each other
  • Complex (psychology), a core pattern of emotions etc. in the personal unconscious organized around a common theme such as power or status

Complex may also refer to:

Arts, entertainment and media

  • Complex (English band), formed in 1968, and their 1971 album Complex
  • Complex (band), a Japanese rock band
  • Complex (album), by Montaigne, 2019, and its title track
  • Complex (EP), by Rifle Sport, 1985
  • "Complex" (song), by Gary Numan, 1979
  • "Complex", a song by Katie Gregson-MacLeod, 2022
  • "Complex" a song by Be'O and Zico, 2022
  • Complex Networks, publisher of the now-only-online magazine Complex

Biology

  • Protein–ligand complex, a complex of a protein bound with a ligand
  • Exosome complex, a multi-protein intracellular complex
  • Protein complex, a group of two or more associated polypeptide chains
  • Species complex, a cluster of very similar species difficult to delimit
  • Pre-Bötzinger complex, a cluster of interneurons in the ventral respiratory group of the medulla of the brainstem

Chemistry

  • Coordination complex, a central atom or ion and a surrounding array of bound molecules or ions
  • Chelate complex, a coordination complex with more than one bond

Mathematics

  • Complex number, an extension of real numbers obtained by adjoining imaginary numbers
  • Complex, an element of a field of sets
  • Chain complex, an algebraic structure
  • Simplicial complex, a kind of topological space
  • CW complex, a kind of topological space
  • Line complex, a 3-dimensional family of lines in space
  • Complex analysis, mathematical analysis of functions of variables which can be complex numbers

Geology

  • Complex (geology), a unit of rocks composed of rocks of two or three types
  • Complex crater, a type of large impact crater morphology
  • Volcanic complex, a group of volcanoes
  • Complex volcano, a volcano of mixed form
  • Accretionary complex, a fossil accretionary wedge

Other uses

  • Building complex, a group of inter-related buildings
  • Housing complex, specifically residential
  • Market complex, group of stores or business firms in a marketplace having common walkway(s), usually enclosed within a boundary or situated under one roof
  • UCL Centre for Mathematics and Physics in the Life Sciences and Experimental Biology (CoMPLEX), part of UCL Faculty of Mathematical and Physical Sciences, London, UK

See also

  • Complexity (disambiguation)
  • Complexity theory (disambiguation)
  • Military–industrial complex