Square root of x formula. Symbol of mathematics.
<a href="https://en.wikipedia.org/wiki/David_Vignoni" class="extiw" title="w:David Vignoni">David Vignoni</a> (original icon); <a href="//commons.wikimedia.org/wiki/User:Flamurai" title="User:Flamurai">Flamurai</a> (SVG convertion)
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