Noun
trim tab (plural trim tabs)
(aviation, nautical) A control surface set within or attached to a larger control surface that provides trim to obtain a desired attitude without constant inputs to the primary control surfaces (e.g., ailerons and rudders).
Death Gravestone (see trim tab Fuller died on July 1, 1983, 11 days before his 88th birthday. Source: Internet
The trim tab on the solar array makes small adjustments to the torque balance. Source: Internet