WatchesAtlas / Watch knowledgeThe Watch EncyclopediaUnderstand the details that make a watch.Explore watches ↗Find a term or abbreviationCategoryAll categoriesMovements & mechanismsComplications & displaysCases, dials & braceletsFinishing & craftsmanshipPerformance & measurementModern watch technologyCollecting, condition & careSearchAllABCDEFGHIJKLMNOPQRSTUVWXYZ2 termsClear filtersMovements & mechanismsArborA shaft supporting a rotating movement component and transferring torque where required.↗Movements & mechanismsAutomatic windingA mechanism that winds the mainspring using the wearer's movement, usually through a rotating weight called a rotor.↗