It looks like whatever you want it to look like. You are the one giving the tests. I'm saying I agree entirely with what you conceive of as an arrowhead, save passing your functional test. And my hypothesized arrowhead meets the previous description. Gimme the test, lest you keep displaying your disengenuousness in full glory.
I don't consider it an arrowhead if it will not actually be an arrowhead. Weird, huh?