Help Identifying Symbol I Found

Hi everybody,

I am writing in hope that someone with more knowledge in occult or witchcraft symbolism than I have will see this post and be able to shed some light on a matter for me.
I just noticed that on the back of my bedroom door, there is a symbol drawn--it looks similar to a crow's foot, but with some additional elements added, and tilted slightly.
I don't think it is specifically directed to me--I think it likely predates my residence here. But, should I be concerned about it--and should I remove it, or take any additional steps?
I don't know a whole lot about my room mate's spiritual life, but he has mentioned that he has family members that are into witchcraft or Wicca.

Below is a link to a picture taken of the symbol.
Any input would be helpful.

Thanks!


[link to www.dropbox.com (secure)]