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This question already has an answer here:

I am looking for a Latex command to print the mathematical contradiction symbol, which is the upside-down T.

marked as duplicate by Henri Menke, Qrrbrbirlbel, barbara beeton, user13907, egreg math-mode May 23 '16 at 22:08

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    Do you mean \bot? – user31729 May 23 '16 at 21:42
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The Comprehensive Symbol Guide is your flexible friend concerning lookup of thousands of symbols:

\documentclass{article}

\begin{document}

$\bot\bot\bot$

\end{document}

enter image description here

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