What characters are NOT present in Unicode?

I have heard that some characters are not present in the Unicode standard despite being written in everyday life by populations of some areas. Especially I have heard about recent Chinese first names fabricated by assembling existing characters parts, but I can't find any reference for this.

For instance, the character below is very common for 50 million people, yet it was not in Unicode until October 2009:

enter image description here

Is there a list of such characters? (images, or website listing such characters as images)

Solution

Also: Here's unicode.org's list of unsupported scripts