Plain English Meaning

An instrument with a small airplane symbol that tilts left or right to show how quickly you are rolling into a turn and how fast you are turning. A ball underneath shows whether your feet and hands are working together properly through the turn.

Full Definition

A gyroscopic flight instrument that shows the rate at which the aircraft is rolling into or out of a turn, and the rate at which it is turning once established. Its gyro is canted about 30 degrees from horizontal, so it senses both roll and yaw. A separate ball in a curved liquid-filled tube, mounted below the miniature aircraft display, indicates whether the turn is coordinated (ball centered), (ball toward the inside of the turn), or (ball toward the outside).