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Is there a LaTeX macro that produces the fat semicolon symbol? As noted in Wikipedia,

A further variation encountered in computer science is the Z notation: $\circ$ is used to denote the traditional (right) composition, but (a fat semicolon with Unicode code point U+2A3E[2]) denotes left composition. This use of semicolon coincides with the notation for function composition used (mostly by computer scientists) in Category theory.

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Kougi Kasane
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    You usually can find the answer to questions like this by looking in the comprehensive symbols list (http://www.ctan.org/tex-archive/info/symbols/comprehensive/). In Table 46 in said document you may find that the stmaryrd package has a \fatsemi command that gives yo uthe fat semicolonn. –  Oct 20 '12 at 07:42

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