Hair knot is a hairstyle that involves tying the hair into a knot or BUN. The two most common types of hair knots are the TANGLE and the BUN. A TANGLE is a type of hair knot that involves twisting the hair into a tight knot. A BUN is a type of hair knot that involves wrapping the hair around itself to form a round shape. Both styles are popular among people of all ages and can be used to create a variety of looks.