Looks like a gang sign - possibly a gang initiation. Wonder if the local 'Gang Strike Task Force' (or whatever it'* called) know'* who those signs correspond with. They might even have a list of recent additions to some gangs and doing the math.... walla.
Sorry to see this Gordy, but glad to hear and see if came off fairly easily.
That area of the metro is getting really bad. The Crystal Anoka area is having problems with gangs, break ins, and home robberies. Now that you have a solid double income you should start looking for a better place ASAP. This could be a sign of things to come.