1) Post 2) Rudderpost 1) Rudderpost 
• (n.) The main part or blade of the rudder, which is connected by hinges, or the like, with the sternpost of a vessel.
Rud'der·stock` noun (Nautical) The main part or blade of the rudder, which is connected by hinges, or the like, with the sternpost of a vessel. 
the vertical member at the forward edge of a rudder, hinged at the sternpost and attached to the helm or steering gear.