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Nano (symbol n) is a unit prefix meaning "one billionth". Used primarily with the metric system, this prefix denotes a factor of 109 or 0.000000001. It is frequently encountered in science and electronics for prefixing units of time and length.

The prefix derives from the Greek (Latin nanus), meaning "dwarf". The General Conference on Weights and Measures (CGPM) officially endorsed the usage of nano as a standard prefix in 1960.

When used as a prefix for something other than a unit of measure (as for example in words like "nanoscience"), nano refers to nanotechnology, or means "on a scale of nanometres" (nanoscale).

A nanosecond (ns) is a unit of time in the International System of Units (SI) equal to one billionth of a second, that is, 11 000 000 000 of a second, or 109 seconds.

The term combines the SI prefix nano- indicating a 1 billionth submultiple of an SI unit (e.g. nanogram, nanometre, etc.) and second, the primary unit of time in the SI.

A nanosecond is equal to 1000picoseconds or 11000microsecond. Time units ranging between 108 and 107 seconds are typically expressed as tens or hundreds of nanoseconds.

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Nano- - Wikipedia