A wheel with pointed teeth that fits into the links of a chain, commonly found on bicycles and in machinery.
Origin uncertain but possibly from German 'sprocket' or Dutch 'sprock.' First appeared in English around the 1600s to describe the toothed wheels used in mechanical devices and gearing systems.
Sprockets are engineering marvels that let you change how hard you pedal a bike—gear up on flat ground, gear down on hills—which is why every invention from bicycles to tanks relies on them to translate human or engine power into useful work.
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