an unconventional arrangement of the tail control surfaces that replaces the traditional fin and horizontal surfaces with two surfaces set in a V-shaped configuration when viewed from the front or rear of the aircraft.
a fully movable aircraft stabilizer that serves the usual functions of longitudinal stability, control and stick force requirements otherwise performed by the separate fixed and movable parts of a conventional horizontal stabilizer.
an empennage configuration in which the horizontal surfaces (tailplane and elevators) are mounted to the top of the vertical stabilizer; the resulting arrangement looks like the capital letter T.
an unconventional arrangement of the tail control surfaces that replaces the traditional fin and horizontal surfaces with four surfaces set in an X-shaped configuration when viewed from the front or rear of the aircraft.