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Zettameter is an SI device for measuring distance. It is equal to 1021 meters. The symbol for zettameter is Zm.
A thousandth of an inch is a derived unit of length in an inch-based system of units. Equal to 0.001 inches, it is normally referred to as a thou /ˈθaʊ/, a thousandth, or (particularly in the United States) a mil.