Originally used to tie off the ends of reef points when shortening sail, this symmetrical, flat knot can be formed with load on both standing parts and can also be untied under tension by pulling on one end and capsizing the knot. It is unsuitable for joining ropes together, but if used to do so, the ropes must be of equal size and type otherwise it will slip.
A Reef Knot is formed with two overhand knots tied in opposite directions so that ends lie back alongside standing parts on their same sides.
A Reef Knot securing a spinnaker pole to its deck chocks.
