pin pallet
/ˈpɪn ˌpalɪt/Watchmaking and Clockmaking
noun
A pallet in the form of a metal pin (in some watches) or semicircular jewel (in certain small clocks), one of which projects from each arm of the escapement and engages alternately with the teeth of the escape wheel. Also (now usually): an escapement having such pallets (also called pin lever).
Origin
Mid 19th century; earliest use found in Edmund Denison (1816–1905), ecclesiastical controversialist, architect, and horologist. From pin + pallet.