The lever escapement is a crucial mechanism in mechanical watches and clocks that regulates the movement of the gear train. It consists of a lever, a pallet fork, and a balance wheel, working together to control the release of energy from the mainspring. This ensures accurate timekeeping by allowing the gear train to advance in precise increments. Invented in the 17th century, the lever escapement replaced earlier designs, improving reliability and precision. It is widely used in wristwatches and pocket watches, making it one of the most common escapements in horology. Its design has influenced many modern timekeeping devices.