They are actually "double square" screw/bolt heads, which is a #2 square with two sets of "corners" offset by 45 degrees, to make it quicker/easier to insert the bit in the screw head. The factory guys are in a hurry, so they don't want to have to fumble around to get their screw gun bit into the head.
That's why you see eight corners instead of the usual four on a Roberts square drive. And the eight corners tend to make people jump to the conclusion it is a torx, but its not.