Knot (unit)

The knot is a unit of speed equal to one nautical mile per hour, exactly 1. 852 km/h. The ISO standard symbol for the knot is kn.

The same symbol is preferred by the Institute of Electrical and Electronics Engineers (IEEE), while kt is also common, especially in aviation, where it is the form recommended by the International Civil Aviation Organization (ICAO).
The knot is a non-SI unit.
The knot is used in meteorology, and in maritime and air navigation.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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