I like the idea of this community but links with no context at all are sorta annoying. I mean just copying and pasting the definition paragraph makes it far more likely for someone to check it out.
Exonumia are numismatic items (such as tokens, medals, or scrip) other than coins and paper money. This includes "Good For" tokens, badges, counterstamped coins, elongated coins, encased coins, souvenir medallions, tags, wooden nickels and other similar items. It is an aspect of numismatics and many coin collectors are also exonumists.