Page 247 - Bob Holtzman "The Field Guide to Knots How to Identify.."

21. Surgeon’s Knot

Also known as: Ligature Knot

Another variation of the Square Knot, this one holds better and is easier to
tie tightly as a binding knot. The second tuck provides extra friction,
holding the structure tight until the knot is finished. Surgeons used this
knot to tie off slippery blood vessels.

Uses: packages, bundles, surgical ligatures
Pros: secure; resists slipping; easier to tie tight under load than a Square Knot

Cons: requires more muscle than a Square Knot to tighten; more difficult to untie

Instructions

1. Start as if you are tying a Square Knot around an object, but tuck the right working end over and under
the left working end a second time before pulling tight.

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