1) Little pinion 
a small wing
• (n.) A little wing; a very small wing. • (n.) A bastard wing, or alula.
A small, stabilizing, rudderlike addition to the tips of a wing to control or employ air movement.
Wing'let noun 1. A little wing; a very small wing. 2. (Zoology) A bastard wing, or alula. 
A small, stabilizing, rudder-like addition to the tips of a wing to control or employ air movement.