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Stick shaker
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A stick shaker is a mechanical device connected to the controls of most business jet, airliners and military aircraft in order to prevent a stall. In larger aircraft (especially in T-tailed jets where it is often impossible to recover from deep stall), some stick shaker systems may include a stick pusher to push the nose down, this reduces the aircraft's angle of attack (AOA).
Outside the plane, on each side of the cockpit, is an AOA sensor, the left side for the captain and the right side for the first officer. They are connected to both pilots' flight controls. When one AOA sensor senses an approaching stall the stick shaker vibrates both pilots' flight controls. When the second AOA sensor senses an approaching stall the stick pusher moves a hydraulic cylinder connected to the flight controls to lower the nose, thus reducing the angle of attack.
Both systems have to be tested and armed before takeoff and remain on during flight.
