Now that's a great hint.

However, please describe how to get the symbols in the name. In all my years with Macs, I realized I've never used symbols. My main browser is Firefox. So, will your hint work with Firefox, too?

of course this works with Firefox, too. Even on the iPad :)

Just open up the Bookmarks Editor and rename your folders. I think in Safari, you can also rename the folders with the context menu.

You can bring up the character palette if you go to System Settings - Locale (? Ländereinstellungen) - Keyboard and select the character palette to be shown alongside your selected keyboard in the system tray.
Or copy & paste from any website...

If you use Firefox, then this is also a solution:

Multirow Bookmarks Toolbar
https://addons.mozilla.org/en-US/firefox/addon/6937/