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A [http://worldclocksite.com world clock] is  a power tool  used to  point , keep, and co-ordinate time. The http://worldclocksite.com 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 [http://worldclocksite.com/time-zones/  time zones]. Watches and other timepieces that can be carried on one's person  are often distinguished from clocks.