A kilometre (American spelling: kilometer) (symbol: km) is a unit of length equal to 1000 metres (from the Greek words khilia = thousand and metro = count/measure). It is approximately equal to 0.621 miles, 1094 yards or 3281 feet.
Slang terms for kilometre include "klick" (sometimes spelt "click" or "klik" ) and "kay". All these slang terms can also refer to kilometres per hour.
Like the kilometre, all units of length in the metric system are based on the metre, by adding an SI prefix that stands for a power of ten, such as hecto for one hundred to form hectometre (= 0.1 kilometre) or mega for one million to form megametre (= 1,000 kilometre).
Unicode has symbols for "km" (㎞), for square kilometre (㎢) and for cubickilometre (㎦); however, they are useful only in CJK texts, where they are equal in size to one Chinese character.
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