<p>Had to do quite a bit of research to find this answer, and finally located it on wikipedia! (Funny how it’s always the last place you look, eh?)</p>
<p>A ∪ B means the set of those elements which are either in A, or in B, or in both
A ∩ B means the set that contains all those elements that A and B have in common</p>
<p>[List</a> of mathematical symbols - Wikipedia, the free encyclopedia](<a href=“http://en.wikipedia.org/wiki/List_of_mathematical_symbols]List”>Glossary of mathematical symbols - Wikipedia)</p>