\documentclass{article}
\usepackage{tikz}
\newcommand*\odagger{\tikz[baseline=(char.base)]{
\node[shape=circle,draw,inner sep=0pt] (char) {$\dagger$};}}
\newcommand*\osquare{\tikz[baseline=(char.base)]{
\node[shape=circle,draw,inner sep=0pt] (char) {$\#$};}}
\begin{document}
\[ A\dagger B \quad A\odagger B \]
\[ A\# B \quad A\osquare B \]
\end{document}