Many hereditary societies create "decorations" (insignia) that members may wear to identify their membership at conferences and other gatherings. The Hereditary Society Community web site has placed images of many of these decorations online.
I must admit that I never realized how many of these decorations exist. I see some of them at various genealogy conferences, but this site lists many more than I have ever seen before.
If you would like to see these decorations, look at http://www.hereditary.us/decorations.htm.