Complex

Complex may refer to:

Biology

Multiprotein complex, a group of two or more associated polypeptide chains
Species complex, a cluster of very similar species difficult to delimit
Mimicry complex, a complex system of organisms and dependencies involved in a case of mimicry

Coordination complex, also called a "coordination compound" or "metal complex", a structure consisting of a central atom or molecule weakly connected to surrounding atoms or molecules (ligands)
Chelate complex, a coordination complex with more than one bond

Complex number, an extension of real numbers obtained by adjoining imaginary numbers
Complex system, a system of interconnected simple parts that together exhibit a high degree of computational complexity from which emerges a higher order behavior
Complex analysis, the study of functions of complex numbers
An element of a complex algebra or field of sets
Chain complex, a (possibly long) sequence of maps
Simplicial complex, a kind of topological space that can be divided into fully adjacent triangles, or more generally, into simplices
CW complex, or closure-finite weak complex, a kind of topological space, a generalization of the simplicial complex
Line complex, a 3-dimensional family of lines in space

Complex (psychology), a group of mental factors that are unconsciously associated by the individual with a particular subject and influence the individual's attitude and behavior
Synonym for a complex system which generally includes all interactions between elements
Complex crater, a type of large impact crater morphology

Complex (magazine), a young men's style/lifestyle magazine
CoMPLEX (ucl) is an interdisciplinary centre at University College London, specialising in bioinformatics and complexity
Complex (English band), a British psychedelic rock band
Complex (band), a Japanese rock band
"Complex" (song), a song by British musician Gary Numan