答案1
一种可能性是使用破折号:
代码:
\documentclass{article}
\usepackage{booktabs}
\usepackage{bbding}
\begin{document}
\noindent
\begin{tabular}{lcc}
\toprule
& ObjectA & ObjectB \\
\midrule
Attribute1 & \Checkmark & --- \\
Attribute2 & --- & \Checkmark \\
Attribute3 & \Checkmark & --- \\
\bottomrule
\end{tabular}
\end{document}