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It mean"knots"......., read this from Wiki: The knot (pronounced not) is a unit of speed equal to one nautical mile (1.852 km) per hour, approximately 1.151 mph.[1] The ISO Standard symbol for the knot is kn. The same symbol is preferred by the IEEE; kt and NMPH are also seen. The knot is a non-SI unit and not accepted for use with the International System of Units (SI).[2] Worldwide, the knot is used in meteorology, and in maritime and air navigation—for example, a vessel travelling at 1 knot along a meridian travels approximately one minute of geographic latitude in one hour.
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