Character Map - Unicode character viewer
$ CharacterMap
$ CharacterMap --search "yak"
Character Map is a GUI application for viewing, searching for, and copying Unicode characters. Alternatively, you can use it to search for characters by name, from the command line.
To open Character Map:
$ CharacterMap
To view a list of all characters that have "yak" in their name:
$ CharacterMap --search "yak"
FontEditor
(1) To edit the fonts instead of just viewing them.