These are the two most commonly used types of screwdrivers, the "Phillips head" (also called a "crosshead") screwdriver and the "flat head" (also called a "standard head") screwdriver. I have also heard the Phillips head screwdriver referred to as a "star" screwdriver, though this is incorrect as there is such a thing as a "star bit" screwdriver, but it has a differently shaped head. For simplicity's sake, when referring to either of these, we just use the name of the tip; i.e. "hand me the Phillips head please".
The Phillips head screwdriver is on the left, the Flathead screwdriver is on the right in this photo. The Phillips head screwdriver was named for a man who bought the idea for its design from a man by the name of John P. Thompson. Henry F. Phillips then refined the design and was integral to the success of its wide usage, beneficial because of the increased torque that it could withstand in industrial usages.
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