A family of Microsoft word processing software products for creating web, email, and print documents.
Use Insert | Symbol | Symbol to open the gallery and choose More Symbols... from the bottom. This opens the familiar symbol dialog, where you can search for and select the needed symbol. Note that the contents of the gallery represents the MRU panel at the bottom of the Symbol dialog, so once you have used a given symbol, it will appear in the gallery until displaced by other more recently used symbols.
These instructions are for Word 2010, but if you are actually using Word 2011, then you should post at http://answers.microsoft.com/en-us/mac/forum/macword.