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

https://josuesexpertblog.novacrestiq.com/posts/what-does-the-seven-year-itch-actually-mean

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