What does 501 refer to from the levi commercial?

Question

I saw a commercial for levis and at the end it was like 501 and my friend said it means something but I don't know what. Can anyone inform me of it's meaning?

Answer 1

501 stands for one of the styles of jeans they have, like straight, skinny, flare, ect.

Answer 2

Yep,,,the style.