\documentclass{standalone}


\usepackage{tikz, amsmath}
	\usepackage{tikz-qtree}
	\usetikzlibrary{cd}
	\usetikzlibrary{arrows}
	\usetikzlibrary{automata}
	\usetikzlibrary{babel}
	\usetikzlibrary{calc}
	\usetikzlibrary{fit}
	\usetikzlibrary{matrix}
	\usetikzlibrary{positioning}
	\usetikzlibrary{shapes.geometric}
	\usetikzlibrary{arrows.meta,bending}

\begin{document}
	\begin{tikzcd}
		\bullet \arrow[dd] \arrow[rr] &  & \bullet \arrow[dd] \\
		& \text{!} &  \\
		\bullet \arrow[rr] &  & \bullet          
	\end{tikzcd}
\end{document}