n (military) An Ancient Roman attack method, where the shields held by the soldiers hide them, not only left, right, front and back, but also from above.
n (computing) A type of robot having a domed case (and so resembling the reptile), used in education, especially for making line drawings by means of a computer program.
n (computing) An on-screencursor that serves the same function as a turtle for drawing.
n (printing|historical) The curved plate in which the form is held in a type-revolving cylinder press.