I know that you can view various characters through the Character Palette (done through the International preference pane) but I usually don’t have the palette activated. This widget allows me to see tons of common symbols (copyright, restricted, Pi, the Apple logo, upside down question marks and exclamation marks, etc…) and how I can get them to display. Usually it’s a simple key combination like Option + S or Option + G. You can grab this widget from here!
