This is the design of the Black Watch logo and badges that each member of the Black Watch wears.
The Black Watch is a kinda vigilante group of ....well....I suppose you could technically call them people....There's a werewolf, vampire, giant zombie, necromancer, "hybrid" (anthro), fallen angel, assassin, elven ranger and a psychotic murdering bound spirit zombie (with a seriously split personality). All of them wear a badge with this logo, and sometimes leave the logo placed around where they have done something to make an example.

It may develop into a full story, but for the minute, it's just a good idea and a way of doing character development practice.