3 ms·

There are also phillips head, straight edge and torx :)

• varjag 16y ago
  Each come in good and bad variety.
  • lwhi 16y ago
    True - but you need to compare like-to-like to make a fair comparison.
• nzmsv 16y ago
  There is also Robertson, which is superior to Philips, but lost due to poor marketing :)
  • pronoiac 16y ago
    What I'd heard was that the Robertson screw, though awesome, didn't take off due to exorbitant royalties, but checking, it looks like he refused to license them to let anyone else make them after getting burned, & having only one supplier worried Henry Ford too much to use them. http://en.wikipedia.org/wiki/List_of_screw_drives#Robertson http://en.wikipedia.org/wiki/List_of_screw_drives#Robertson
    • lwhi 16y ago
      Sounds a bit like Android vs iOS (or Windows vs. MacOS).