Constrictor Hitch

Among the most useful knots is the constrictor hitch. It acts like a clove hitch, but it locks down upon itself. You can use it as a quick whipping, to start a lashing, to secure a sack, and for jury rigging a topping lift to a spinnaker pole. It's handy in emergencies. It can be easily tied on the bight, or by passing an end. Worth knowing, although it takes a bit of time to learn when tied from the end. It is more easily tied on the bight.