Square Knot
Procedure: Take two ropes and cross them (red over blue) to form a half knot. Cross them a second time (red over blue again) and pull the ends tight to form the Square Knot.
Purpose: It is intended to be a binding knot and, tied in the right material against a curved surface, the first Half Knot may bind – but it cannot be trusted. That is why surgeons use an extra turn in the first Half Knot – to achieve the binding required while they prepare the second Half Knot.
Source: AnimatedKnots.com
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