Question #76737 on gucharmap in ubuntu changed:
https://answers.launchpad.net/ubuntu/+source/gucharmap/+question/76737

    Status: Open => Answered

Derek White proposed the following answer:
It either means you don't have the language/font installed to be able to
display it, or it is a command for things like right-to-left languages,
line feed, tab, etc.

There are many "characters" that aren't really letters/numbers. Check out the 
ASCII characters:
http://ascii-table.com/ascii.php

The first 32 (0-31) are commands as I described with no visual
representation.

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