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One of the characteristics of an electrical connector is called its “clocking” or “polarization”. During manufacturing, a connector is polarized by fabricating a series of keys around the perimeter of the insert in a specific pattern according to its polarization designator. Therefore, two connectors will not be able to mate (AKA connect) unless they accurately line up or clock. Learn about Connector Clocking here: https://www.interconnect-wiring.com/aerospace/what-is-connector-clocking-and-why-is-it-important-in-wiring-harness-design/.