Page 14 - Patrick Moreau-Marine "Knots How to Tie 40 Essential Knots"

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Figure-Eight Knot

The figure-eight knot is an improvement on the half knot. It is commonly used to
keep a sheet from coming out of a fairlead or a pulley. Even after strenuous use,

this knot can still be untied. This is why it is the basic knot sailors use to secure a
rope.