You add it to the beginning of a unit, such as nanosecond. It means a factor of !0^-9 of the unit. So a nanosecond would be 10^-9 of a second or .000000001 of a second.
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Nanometers, just like meters, are used to measure length.
1 nano = 1 * 10^-9
5.3657 x 10^4 nano seconds
10-9 meters
A nano second. It is 1000 times larger than a picosecond