What is this tool for? I recently found this in my cycling shirt. I don't know where it came from, and what it is used for. It reads "Simson" on the other side, but I have no clue what I could use it for. Does it have anything to do with spokes?
It's a spoke wrench.

Similar to this one:

http://www.btosports.com/p/bikemaster-spoke-wrench