Atlanta is frequently referred to as "the 404" due to it being one of our area codes for calling.
April 4th is an informal city holiday, "404 day".
Lots of artists and companies make "404" branded stuff, and you generally see the number all over the city:
https://mondaynightbrewing.com/beer/404-atlanta-lager/
https://sneakernews.com/2025/03/21/adidas-superstar-404-day-...
Doesn't this happen for lots of area codes? 305 for Miami in particular as Mr. Pitbull likes to remind us.
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412 is the area code for Pittsburgh and is all over the place with branding and slogans. Area codes in general are a common signifier within communities and the population. It’s always neat to see locals rep their area codes as advertisement or branding, I like it