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

https://codysuniquecolumn.talesignal.com/posts/why-do-designers-like-the-number-7-as-a-symbol

The number 7 is seen as lucky in slots and pop culture because it often signals big wins, like hitting “777” on classic reels. It’s also linked to positive ideas like the seven-day week, making it a familiar symbol of good fortune and balance