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The yoctometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: ym) or yoctometer (American spelling) is an SI measure of length that is equal to 10−24 (yocto) of a metre. It is the smallest named subdivision of the metre in the SI base unit of length.
Dekameter or decameter is a common metric unit of distance. It is equal to 10 meters or 32.8084 feet. Plural name is dekameters.