Reef Knot
Name:
Reef knot, square knot, hercules knot, honmusubi (本結び)
Type:
Knot, Single Column Knot
Use:
Used in Shibari as a single column knot - this knot can come undone however there are a number of modifications that can be added to it to make it more secure.

How To Tie A Reef Knot
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Final result
Reef knot with quick release
From number 7, tie a quick release-
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Final Knot.