How do I use an "intersection" symbol in word?
If you're using Office 2011 on a recent OS X system, then its relatively easy to get a host of characters available.

Go to System Preferences > Keyboard > Keyboard tab and check Show Keyboard and Character Viewers in menu bar.

This will put a little icon, usually next to the Date/Time, in the menu bar.

From the new Menu Bar icon, choose Show Character Viewer and then select Math Symbols from the picker:



A host of symbols. Put the insertion point in your Word document, then double-click the symbol you need.