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The Pozidriv screw type is patented, similar to cross-head but designed not to slip, or cam out. It has four additional points of contact, and does not have the rounded corners that the Phillips screw drive has. Phillips screwdrivers will usually work in Pozidriv screws, but Pozidriv screwdrivers are likely to slip or tear out the screw head when used in Phillips screws. Pozidriv was jointly patented by the Phillips Screw Company and American Screw Company.
At a glance the Phillips and Pozidrive screws appear almost the same. The distinguishing mark is a line embossed in the screw head at 45 degrees to the slots for the driver. Thus, if the driver slots are at 0, 90, 180 and 270 degrees, the marker lines are at 45, 135, 225 and 315 degrees.
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"Pozidriv"