Another use is the "printers daemon" [0] which sits on the shoulder, and points out (or not) the typos as you compose the line of type.

There is a rather nice door lintel at the Queensland Government Printery which has a printers daemon leering at the public as they pass.

given some flexibility, you can see linkage to "bugs" in "typos"

[0] https://www.timetravelclub.com.au/2015/07/devils.html