# Complex

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**Complex** commonly refers to:

- [Complexity](/source/Complexity), the behaviour of a system whose components interact in multiple ways so possible interactions are difficult to describe - [Complex system](/source/Complex_system), a system composed of many components which may interact with each other
- [Complex (psychology)](/source/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)](/source/Complex_(English_band)), formed in 1968, and their 1971 album *Complex*
- [Complex (band)](/source/Complex_(band)), a Japanese rock band
- [*Complex* (album)](/source/Complex_(album)), by Montaigne, 2019, and its title track
- [*Complex* (EP)](/source/Complex_(EP)), by Rifle Sport, 1985
- ["Complex" (song)](/source/Complex_(song)), by Gary Numan, 1979
- "Complex", a song by [Katie Gregson-MacLeod](/source/Katie_Gregson-MacLeod), 2022
- "Complex" a song by [Be'O](/source/Be'O) and [Zico](/source/Zico_(rapper)), 2022
- [Complex Networks](/source/Complex_Networks), publisher of the now-only-online magazine *Complex*

## Biology

- [Protein–ligand complex](/source/Protein%E2%80%93ligand_complex), a complex of a protein bound with a ligand
- [Exosome complex](/source/Exosome_complex), a multi-protein intracellular complex
- [Protein complex](/source/Protein_complex), a group of two or more associated polypeptide chains
- [Species complex](/source/Species_complex), a cluster of very similar species difficult to delimit
- [Pre-Bötzinger complex](/source/Pre-B%C3%B6tzinger_complex), a cluster of interneurons in the ventral respiratory group of the medulla of the brainstem

## Chemistry

- [Coordination complex](/source/Coordination_complex), a central atom or ion and a surrounding array of bound molecules or ions
- [Chelate complex](/source/Chelate_complex), a coordination complex with more than one bond

## Mathematics

- [Complex number](/source/Complex_number), an extension of real numbers obtained by adjoining imaginary numbers
- Complex, an element of a [field of sets](/source/Field_of_sets)
- [Chain complex](/source/Chain_complex), an algebraic structure
- [Simplicial complex](/source/Simplicial_complex), a kind of topological space
- [CW complex](/source/CW_complex), a kind of topological space
- [Line complex](/source/Line_complex), a 3-dimensional family of lines in space
- [Complex analysis](/source/Complex_analysis), mathematical analysis of functions of variables which can be complex numbers

## Geology

- [Complex (geology)](/source/Complex_(geology)), a unit of rocks composed of rocks of two or three types
- [Complex crater](/source/Complex_crater), a type of large impact crater morphology
- [Volcanic complex](/source/Volcanic_complex), a group of volcanoes
- [Complex volcano](/source/Complex_volcano), a volcano of mixed form
- [Accretionary complex](/source/Accretionary_complex), a fossil accretionary wedge

## Other uses

- Building complex, a group of inter-related [buildings](/source/Building#Complex) - [Housing complex](/source/Housing_complex), specifically residential - [Market complex](/source/Shopping_center), 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](/source/UCL_Faculty_of_Mathematical_and_Physical_Sciences), London, UK

## See also

- [Complexity (disambiguation)](/source/Complexity_(disambiguation))
- [Complexity theory (disambiguation)](/source/Complexity_theory_(disambiguation))
- [Military–industrial complex](/source/Military%E2%80%93industrial_complex)

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Adapted from the Wikipedia article [Complex](https://en.wikipedia.org/wiki/Complex) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Complex?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.