The remains of branches in timber A branch sawn off close to the trunk or shed naturally forms a sound or live knot A broken branch stub which becomes surrounded by new growth produces a loose or dead knot in the timber
- a measure of speed It is one nautical mile per hour Never refer to "knots per hour" unless you want to describe acceleration A nautical mile is one minute of one degree of longitude and is slightly longer than the ordinary, or statute, mile used in the United States To convert nautical miles to miles or knots to miles per hour, multiply by 1 15 To convert miles to nautical miles or miles per hour to knots, divide by 1 15