The textile industry has a long history and there are various units in use. Common ways to describe the lineal density of a textile are;
Tex (tex) – Grams per 1,000 meters of yarn. Tex is a direct measure of linear density.
Deci-tex (dtex) – Grams per 10,000 meters of yarn. Dtex is a direct measure of linear density
Denier (den) – Grams per 9,000 meters of yarn. Denier is a direct measure of linear density
Yield – Similar to tex and denier, yield is a term that helps describe the linear density. However, unlike tex and denier, yield is the inverse of linear density and is usually expressed in yards per pound (yd/lb).