Pile is the raised surface or nap of a fabric, consisting of upright loops or strands of yarn. Examples of pile textiles are carpets, corduroy, velvet, plush, and Turkish towels. The word is derived f

Knot density is a traditional measure for quality of handmade or knotted pile carpets. It refers to the number of knots, or knot count, per unit of surface area - typically either per square inch or p