Fonts included with Mac OS X 10.5 Leopard are installed in one of these folders: /Library/Fonts /System/Library/Fonts You can turn a font on or off using Font Book to customize what fonts appear in an application's font menu, or in the Font panel. You don't normally need to worry about which Mac OS X 10.5 fonts you turn off or remove; any font that is required by the system, such as AquaKanaBold.o