Put a vertical line at the right hand side of a symbol

Question

I want to create a symbol that looks like:

I recently learned that I can use \underset{-}{\lessdot} to get:

But I need to put another vertical line at the right hand side. How can I do that?

Answer 1

You can make it yourself by putting a \cdot inside \triangleleft. And I'd prefer to use \underline rather than \underset

\documentclass{article}

\newcommand{\tdot}{\underline\triangleleft\kern-3.2pt{\cdot}\thinspace}

\begin{document}

\[
x \tdot y
\]

\end{document}