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This question already has an answer here:

How can I type this symbol in LaTeX?

Strong near

stong far

marked as duplicate by Alan Munn, Mensch, Troy, TeXnician, Stefan Pinnow Nov 27 '17 at 5:31

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    Welcome! Which symbol? That is, are these 2 symbols, a \delta with something on top and another \cancel\delta with something below, or 4 symbols? Please see also detexify. – marmot Nov 27 '17 at 3:11
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This is just to give you an idea to deal with such thing:

\documentclass{article}
\usepackage{amsmath}
\usepackage{cancel}
\begin{document}
$\overset{\wedge\!\!\wedge}{\delta}$

$\underset{\vee\!\!\vee}{\cancel{\delta}}$
\end{document}

enter image description here

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