Nano- is an SI prefix meaning one billionth. Used primarily with the metric system, this
prefix denotes a factor of 10−9 or 0.000000001. It is frequently encountered in science and
electronics for prefixing units of time and length. Examples:
One nanometer is about the length that a fingernail grows in one second. Three gold atoms lined up are about one nanometer
long. If a toy marble were one nanometer wide, Earth
would be about one meter wide. The prefix is derived from the Greek νᾶνος,
meaning “dwarf”, and was officially confirmed as standard in 1960. When used as a prefix for something other
than a unit of measure, nano refers to nanotechnology, or on a scale of nanometres. See nanoscopic scale. References

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