There's an easier way to get the basic engineering symbols into a text. Look at the top menu line for a toolbar called TEXT PROPERTIES. The icon on the extreme right lets you insert text symbols, and the omega is there. The icon has 3 symbols on it: Diam, Perpendicular and Symmetry. This icon is available many places in V5 where you type text.
If the symbol you want is not there, then use Bjod's method.