LaTeX Q.E.D. Symbol
Aug. 06, 2024
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\documentclass{article}
\usepackage{ntheorem}
\usepackage{latexsym}
\renewcommand\qedsymbol{\ensuremath{\Box}}
\begin{document}
\verb*|\qedsymbol| \qedsymbol
\verb*|$\qedsymbol$| $\qedsymbol$
\end{document}
It should be noted that latexsym package should be imported3, otherwise an error will occur:
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Command \Box not provided in base LaTeX2e.
References