The yarn numbering system based on length and weight originally used for cotton yarns and now employed for most staple yarns. It is based on a unit length of 840 yards, and the count of the yarn is equal to the number of 840-yard skeins required to weigh one pound. Under this system, the higher the number, the finer the yarn. A typical carpet yarn might be a three cotton count two plied, written as 3.0/2c.c.