In Mac classic OS – before OS X – one could easily find the special characters, such as Greek letters, special symbols, etc. using 'Keycaps'. The equivalent functionality in OS X is provided by 'Keyboard Viewer'. You will need to enable it if you want to use this function. Here is how to do it:
- Click the Apple Icon in the top left-hand corner
- Select System Preferences
- Click International
- Click Input Menu
- Enable (check) the Keyboard Viewer
- Close System Preferences
- Now click the Input Menu icon () and the Keyboard Viewer is there...