tiller

1. The stock; a beam on a crossbow carved to fit the arrow, or the point of balance in a longbow.
2. A bar of iron or wood connected with the rudderhead and leadline, usually forward, in which the rudder is moved as desired by the tiller (FM 55-501).
3. The handle of the rudder which the helmsman holds to steer the boat, a piece of wood or metal extending forward from the rudder over or through the transom. Generally attached at the top of the rudder.
4. A steering wheel, usually mounted on the lower portion of the captain's control column, which is used to steer the aircraft's nosewheel or tailwheel to provide steering during taxi.
5. A handle; a stalk.
6. The rear-wheel steering control, aboard a tiller truck.

Plural tillers