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I know how to generate the symbol \Delta. But is there a way to generate the similar triangle symbol underlined in pink:

enter image description here

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    \mathnormal{\Delta} – egreg Apr 17 '17 at 15:17
  • This doesn't seem to work on, i.e., math.stackexchange. – George Apr 17 '17 at 15:19
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    Is this a LaTeX or MathJax question? – TeXnician Apr 17 '17 at 15:33
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    @George MathJax is not TeX, it only shares (part of) the syntax. – egreg Apr 17 '17 at 19:44

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