Thinking about badges and how people reveal their membership in things…
Millitary service ribbons have a rank ordering.
Blog authors announce their affiliation with various vendors, standards, etc.
Boy scouts can wear one of these to reveal their religion, except for Unitarians.
Pins are very popular in the Soviet Union. People collect them.
This power adaptor claims to be very conformant.
And yard signs…
http://williamtozier.com/slurry/comment/social/signsAndSymbols.html