How to delete a copy of a system font

OS X normally will not display a character in the Private Use Area unless you manually set the font in the app. I understand this is intentional, since every font could have a different glyph at the same PUA code point, and it only makes sense to display something when the user specifies the font.

I think it should also work when the right font is selected via CSS or other markup in a document being read.

Some earlier versions of OS X did not have this "feature" and did display PUA stuff. I don't know how they chose which font to use when more than one had something at the code point selected.

You can use Pacifist to reinstall Font Book in your system. It will ask you if you want to replace it. You will need an image of your OS in an accessible pack.

Don't know if you can 'rm' the folder's content. Never tried, but fonts must be installed in the user's location and not in the System folder.

I think with 'setenv' we can link external folders with custom organized fonts to system/paths.

I'm working around because for years I used many fonts and tried to reorganize them with a minimal system set and no third-party apps like FontExplorer or others.