Posidrive

Posidrive

A type of screw and screwdriver, designed to be an improvement on the classic cross-head screw. See the Phillips dictionary entry for more details.

Despite the similarity of shape between these two types of tool and screw, it is important to use the right tool to ensure you don't damage the screw. See http://www.shadetreemg.com/posidrive.htm for a brief rant on this subject.