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A clock is a tool used to designate , keep, and co-ordinate time world clock. The clockis derived ultimately (via Dutch, Northern French, and Medieval Latin) from the Celtic words clagan and clocca meaning "bell". A silent instrument missing such a mechanism has traditionally been known as a timepiece at world clock map. In general usage today a "clock" refers to any device for valuing and displaying the world clock. Watches and other timepieces that can be carried on one's soul are often distinguished from clocks.