\begin{table}
\begin{tabular}{*6l}
\X\sum &\X\bigcap &\X\bigodot \\
\X\prod &\X\bigcup &\X\bigotimes \\
\X\coprod &\X\bigsqcup &\X\bigoplus \\
\X\int &\X\bigvee &\X\biguplus \\
\X\oint &\X\bigwedge
\end{tabular}
\caption{Variable-sized Symbols}\label{op}
\end{table}