Half hitch
The half hitch is a simple overhand knot, where the working end of a line is brought over and under the standing part. Insecure on its own, it is a valuable component of a wide variety of useful and reliable hitches, bends, and knots.
Two successive half hitches tied around an object makes up the common clove hitch. Two successive half hitches tied around the standing part a rope is known as two-half-hitches or double half hitch.