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TheCytochromeC wrote:If you think torx are unusual, check out this guy.

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That's a triple square bit, because it has 12 points, similar to three superimposed squares.

They're used in a lot of European vehicle makes.

They aren't particularly cheap or easy to find either.

So -that's- what those are! I've got a quarter-inch bit set that has several of those, along with some other weird stuff (security flat-heads, "offset" Phillips bits, and three-bladed pseudo-Phillips bits). I don't know that I've seen any of these in the wild, however, with the sole exception of security flat-head screws.

I'm going to disagree most whole-heartedly on the Roberson head screws, based on an incident just earlier today. I'm refurbishing a chicken coop, and there was a swinging panel, originally intended as a sun-shade, that had warped and needed to be removed. The hinges were secured by Roberson screws, ALL of which rounded out. I have destroyed Phillips, flat-head, and yes, even Torx, but I've never managed to round out a screw head that quickly before.

I undid the other side of the hinges, which resulted in many colorful metaphors when it fell on my head, as there is literally no way to remove those stupid Roberson screws, short of cutting them out of the wood.