I looked it up on detexify but apparently it is not an inbuilt symbol
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2 Answers
7
I think the easiest way is:
\documentclass{article}
\usepackage{amsmath}
\begin{document}
$X \overset{\triangle}{\longrightarrow} Y$
\end{document}
Result:
Blooment
- 666
5
Like this?
\documentclass{article}
\usepackage{amsmath}
\begin{document}
[ X\xrightarrow{\enspace\smash{\raisebox{-0.2\height}{$\scriptstyle\triangle$}}\enspace}Y ]%
\end{document}
Bernard
- 271,350


\Delta) and the arrow (\rightarrow) and tack them on top of each other using the technique in the linked questions. – Raven Aug 25 '20 at 06:09