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\documentclass{article}
\usepackage{bbding}
\usepackage{pifont}
\usepackage{wasysym}
\usepackage{amssymb}

\begin{document}

% amssymb
\checkmark

% bbding
\Checkmark
\CheckmarkBold

% pifont
\ding{51}
\ding{52}

% wasysym
\CheckedBox

\end{document}