Definition of

Knot

Knot
A unit of speed equal to one nautical mile per hour, or 1.151 mph (approximately), or 1.852 km/h (exactly).

Often used for the speed of ships.

Also, a knot is a curve in 3D space that closes back on itself, does not intersect itself, and cannot be untangled to make a simple loop.
Knot

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