High Quality Content by WIKIPEDIA articles! The International System of Units (SI) specifies a set of unit prefixes, known as SI prefixes, also known as metric prefixes. An SI prefix is a name that precedes a basic unit of measure to indicate a decimal multiple or fraction of the unit. Each prefix has a unique symbol that is prepended to the unit symbol. The SI prefixes are standardized by the International Bureau of Weights and Measures in resolution dating from 1960 to 1991. SI prefixes are used to reduce the number of zeros shown in numerical quantities before or after the decimal point. For example, an electrical current of 0.000000001ampere, or one-billionth (short scale) of an ampere, is written by using the SI-prefix nano as 1 nanoampere or 1 nA.

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