Screwdriver
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A screwdriver was a tool. After an infostamp left him believing he was the Doctor, Jackson Lake carried such a tool, calling it his "sonic screwdriver". (TV: The Next Doctor)
It could also be used as a weapon. Miss Quill told Charlie to stab a screwdriver through the hand of Orla'ath - a guise of the Lankin. (TV: Nightvisiting)