| The knot is defined as one nautical mile per hour | |
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| There is no internationally agreed symbol, but the symbol kn is commonly used | Wilson, Alastair 22 July 2009 |
Since the 1890s or thereabouts, it has been drummed into the young seaman that a knot is a unit of speed, namely, one nautical mile per hour; and that consequently only the uneducated speak of "knots per hour" or "knots an hour".
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