a metric unit of length equal to one billionth of a meter
An SI subunit of length equal to 10 metres. Symbol: nm
A nanometre is a unit of length in the metric system, equal to one billionth of a metre. The name combines the SI prefix nano- with the parent unit name metre. It can be written in scientific notation as 1×10^−9 m, in engineering notation as 1 E−9 m, and is simply 1 m / 1,000,000,000.
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