A gallows; the post on which malefactors are hanged, or on which their bodies are exposed. It differs from a common gallows, in that it consists of one perpendicular post, from the top of which proceeds one arm, except it be a double gibbet, which is formed in the shape of the Roman capital T. Enc. Lond.
GIBBET
TheLaw.com Law Dictionary & Black's Law Dictionary 2nd Ed.