Math & Science ⇒ medium size $\cup$
medium size $\cup$
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medium size $\cup$
one option could be to load the relsize and exscale packages and to use \mathsmaller{\bigcup}; take a look at the following example that gives four sizes for the union symbol:
Code: Select all
\documentclass{article}
\usepackage{relsize}
\usepackage{exscale}
\begin{document}
$\cup\mathsmaller{\bigcup}\bigcup\mathlarger{\bigcup}$
\end{document}