Can someone please tell me what this symbol means??

Question

http://www.bucklecity.com/v/vspfiles/photos/lab-33-p1179-2T.jpg

I have seen this symbol a couple of times and i have no idea what it means or what its called.

So...if anybody knows...please tell me!

Answer 1

tau gamma phi, triskelion, only shaped a bit differently. unless its a ninja weapon :D