For the first 17 years between 1873 to 1890, Levi’s waist overalls (as jeans were called then) were known simply as XX.
They were rebrand as 501 when the patent for rivets expired.
Nowadays, 501 is a branding feature loaded with meaning. As the most iconic jean in the world, 501 has evolved from simply meaning a top-of-the-line product to one loaded with socio-political values. ‘501’ implies rockstars, activists, rebels and Hollywood movie stars.