A segment of a supplementary wrapping weft whose cut ends project above the surface of the rug. Although called a “knot”, the yarn segments are not actually tied, but just wrap around the warp yarns and are held in place by the ground weft yarns. Depending on the coarseness of the yarns and how closely they are set, the number of “knots” per square inch of a rug or carpet can range from less than 50 to more than 1000.