This simple knot will help you attach a rope to a stationary object, e.g. to moor a boat to a pier. It doesn’t jam and is easy to untie. The knot is extensively used in boating, although it is not fail-safe. For additional security pull the knot tight or seize the ends with a twine.
ABoK #1720, #1721, #1784, #1834, #1835, #1836, #1883, #1884, #1910
Pass the rope around the post from behind.
Turn it around the post 2 more times.
Pass under the standing part, then over it and through the loop to make a half hitch.
Make another half hitch the same way.
Seize the ends with a twine.
The Round Turn & 2 Half Hitches knot is complete.