rudder
A control surface on fixed-wing aircraft, usually mounted at aft end of the fuselage sticking up (like a dorsal fin), that controls yaw (heading), and is controlled by the pedals; Symbols: delta sub R; Typical Units: rad, deg;
A hinged, movable section of the vertical stabilizer used to control the aircraft's yaw. Also used as a verb, meaning to angle the rudder in a particular direction.
