device

device (http://definr.com/device)

     n 1: an instrumentality invented for a particular purpose; "the
          device is small enough to wear on your wrist"; "a device
          intended to conserve water"
     2: something in an artistic work designed to achieve a
        particular effect
     3: any clever (deceptive) maneuver; "he would stoop to any
        device to win a point" [syn: gimmick, twist]
     4: any ornamental pattern or design (as in embroidery)
     5: an emblematic design (especially in heraldry); "he was
        recognized by the device on his shield"