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A world clock is a power tool used to indicate , keep, and co-ordinate time. The world clock ap is 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. In general usage today a "clock" refers to any device for evaluating and displaying the time zones map. Watches and other timepieces that can be carried on one's person are often distinguished from clocks.