[Tex/LaTex] dotted box placeholder symbol

Question

I am looking for a dotted box as a placeholder for a "normal sized" character.

For example I would like to put it under a function to represent the placeholder, e.g. \sqrt{\dottedbox}. Something like this:

Answer 1

The stix package provides a \dottedsquare symbol that could fit.

\documentclass{article}
\usepackage{stix}
\begin{document}                         
     $\dottedsquare\sqrt{\dottedsquare}$
\end{document}