Ok, here's more than you wanted to know:
The TORX drive system was developed in the Camcar Technical Center, located in Rockford, Illinois. By design, TORX head screws resist cam-out better than Phillips head or slot head screws. Where Phillips heads were designed to cause the driver to cam out, to prevent over-tightening, TORX heads were designed to prevent it. The reason for this was the development of better torque-limiting automatic screwdrivers for use in factories. Rather than relying on the tool slipping out of the screw head when a torque level is reached, and thereby risking damage to the driver tip, screw head and workpiece, the drivers were designed to consistently achieve a desired torque. Camcar LLC claims this can increase tool bit life by ten times or more.
