Twelve Knots = 14 miles per hour.
Twelve knots of wind is my ideal sailing weather. Back when I sailed The Dread Pirate Roberts (a 12ft dinghy called a Laser) twelve knots of wind was the most I could handle while still staying upright. Too much more than that and I would capsize. For me, twelve knots, has become a bit of a mantra for finding the balance between my limits and flying.