There is a silver figure on the back of my key

Just picked up my 2010 BMW M3 this afternoon. On the back of my key, there is a picture of a silver stick looking figure. I assume she is a woman because there looks like a skirt. Has anyone ever heard of this before?

Yep, picked my 2011 M3 up on Saturday and got the two keys, one male and one female.

Saw you got your answer on another forum. The car came with a set of stickers so that owners could ID keys. I have the male on my key and put the female on the spare for my wife though she has yet to actually drive the car after more than two years of owning it!

Thank you