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This question already has an answer here:

symbol graph

I want to know how to type the symbol above in LaTeX, thanks!

marked as duplicate by Sebastiano, Bobyandbob, TeXnician, marmot, Phelype Oleinik Mar 6 '18 at 12:19

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  • $[\![ ]\!]$ is ok. – Jie Huang Mar 6 '18 at 7:57
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    detexify is a useful thing to know about! – Roly Mar 6 '18 at 8:42
  • Is the symbol used like, say, +? That is, like a binary operation symbol? – egreg Mar 6 '18 at 9:04
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enter image description here

\documentclass{article}
\usepackage{ stmaryrd }
\begin{document}

with \verb+stmaryrd+ package : $ \rrbracket$

\end{document}

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