It's something I've seen in some other groups' symbolism and stuff I think, so I'd be surprised if anybody thinks it's meant to be scary. I researched it my sophomore year for one of my classes (way before ever even thinking about joining Chi O!)
Basically I found a lot of different interpretations, some signifying the combination of leadership and courage with profound philosophical thought.
I have no idea where I found it because all I have is an old paper I wrote stuck in a folder, otherwise I'd try to be more helpful
Greek Love,
April