Make list of all the unassigned glyphs
Written by Pete Baumgartner
This script makes a list of all the unassigned glyphs in the active document and writes the result to the extendscript toolkit JavaScript console.
Missing glyphs in text
The result after running the script
Download the script from here.
Here is an improved version of the script written by Peter Kahrel.
Check out also an article written by David Blatner.