Trim tab
A small control tab mounted on the trailing edge of a movable control surface. The tab may be adjusted to provide an aerodynamic force to hold the surface on which it is mounted deflected in order to trim the airplane for hands-off flight at a specified airspeed.
Aviation Maintenance Technician Handbook — Airframe, p. G-37
Also defined in 1 more source
A small auxiliary hinged portion of a movable control surface that can be adjusted during flight to a position resulting in a balance of control forces.
Taught in AF-C Concepts, AF-C Procedures.