Hobo Code and Symbols

I thought that this was interesting:
http://www.bbc.com/future/story/20151217-the-secret-codes-youre-not-mean...

Hoboglyphs:
http://weburbanist.com/2010/06/03/hoboglyphs-secret-transient-symbols-mo...

Hobo code:
http://www.hobo.com/whatisahobo/hobocode.html

An ethical code was created by Tourist Union #63 during its 1889 National Hobo Convention in St. Louis Missouri. This code was voted upon as a concrete set of laws to govern the Nation-wide Hobo Body