The WINDSOR knot is a type of necktie knot that is characterized by its symmetrical and triangular shape. It is one of the most popular knots for neckties, and is often used in formal occasions. The knot is also known as the Full WINDSOR or Double WINDSOR, due to its size and complexity. It is created by crossing the wide end of the tie over the narrow end twice, then passing the wide end through the loop and tightening. The WINDSOR knot is considered to be the most formal of all necktie knots, and is often used in business and formal settings.