zepto- (z-)
zepto- (z-) :
A metric prefix denoting 10-21 (one sextillionth). Adopted by the CGPM in 1990, the prefix is derived from the Latin septem, meaning 7, because this is the seventh prefix (n = 7 in 10-3n) in the SI system of metric prefixes. The swas replaced by a z to avoid confusion with the abbreviation for the second, which is an SI base unit
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