The half knot (hitostu-musubi, つ結び) is one of the most fundamental knots. It forms the basis of many other knots, such as the square knot.
By joining two ends, the half knot evolves into a trefoil knot (a true knot in the mathematical sense). It is commonly used in activities such as reefing, furling, tying up parcels and shoestrings.
How to Tie the Half Knot (Joining Two Ends)
Cross the left end over the right end and tuck it under, thereby forming a half knot.
Tighten the knot.