It is Pittsburgh's Area Code. It is on merchandise and is known around the world. It's famous n'at.
Person 1: May I ask where are you from?
Person 2: I'm from da Burgh
, da 412
. I'm from Pixburgh
, Pennsivania. Da six time super bowl champs, Home of da Stillers
! The good ole' Iron City
Person 3: Ah, you are what they call a Yinzer