Square Knot / Sailor’s Knot

This is a way to tie an Overhand-knot once from each side and make a Square-knot. Historically, it can be confirmed by the photographs of gentlemen wearing Cravat since the 17th century. Also, since the 19th century it became a scarf knot used for European and American navy-uniform, and therefore it is also called Sailor's-Knot.