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This 19th-century engraving depicts the Surgeon's Knot, a key knot used in surgery at that time. It was primarily employed to ligate (tie a thread around) an artery to control bleeding during operations.The surgeon's knot is a reinforced variation of the square knot (reef knot). It differs by adding an extra wrap in the first throw, creating a double overhand knot initially, which provides greater friction and prevents slipping. This was essential when working with slippery, wet living tissues. It is then secured with one or more opposing single throws.In the 19th century, before widespread aseptic techniques and modern sutures, surgeons commonly used silk, catgut (animal intestine), or even horsehair threads for ligatures. This knot was vital for reliability without modern aids.The illustration shows the knot styled as a ribbon, with shaded ends, emphasizing its looped structure. â–º Vintage etching circa late 19th century. Digital restoration by Pictore. Free of AI