Knotted carpet with colorful wave-like motifs from Yanghai (Subeshi culture) were dated to 700 BCE, and are now the oldest known knotted carpet in the world, before the 4th century BCE Pazyryk carpets. Turpan Museum.
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
Back side of a Qom rug with very high knot density