The number 7 is seen as lucky in slots and pop culture because it often signals...

https://codysuniquecolumn.talesignal.com/posts/can-i-trust-lucky-symbols-like-7-to-predict-wins

The number 7 is seen as lucky in slots and pop culture because it often signals a big win, like hitting 777 on the reels. Its positive vibe also ties to things like the seven-day week, which feels familiar and complete