In deepest Austria, there is a small village called "Anger". The main road in Anger winds up a hill around a very old church in the center of town. In the oldest part of the church is a medieval grave marker that commemorates a benevolent butcher. The marker is decorated with broken crossbones. This pin's design is an abstraction of that grave marker's design.
More about Anger here on my site:
http://ellingson.cc/ellingsonbridge