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

https://www.beacon-bookmarks.win/the-number-7-is-lucky-in-slots-and-pop-culture-because-it-s-long-been-a-symbol

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