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I think Torx is just the specfic brand. I don't know what this style bit is actually called, but they seem to have adopted the name "Torx." Similar to the way Americans use the work Kleenex when referring to tissue paper.
Anyways, I think the official Torx bit has a small hole/indentation on the tip added security measure so that official torx slots will require the offical torx bit.
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