Calling mechanics - what is this screw

I looked here



https://en.wikipedia.org/wiki/List_of_screw_drives



and it's not listed. It's "serrated" around the edges (like a gear) and the hole is round. I need to unscrew it to open my laptop.

via International Skeptics Forum http://www.internationalskeptics.com/forums/showthread.php?t=286833&goto=newpost