Rudderpost

noun

2. Nautical, in a screw ship, an after stern-post, on which the rudder is hung, abaft of the propeller.
3. The shank of a rudder, having the blade at one end and the attachments for operating it at the other.
4. The shank of a rudder, having the blade at one end and the attachments for operating it at the other.
5. a vertical post at the forward edge of a rudder that enables the rudder to pivot