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

https://www.bookmarking-planet.win/the-number-7-is-seen-as-lucky-in-slots-and-pop-culture-because-it-s-been-tied

The number 7 is seen as lucky in slots and pop culture because it’s often tied to good fortune. Classic slot machines, like those at MrQ, show 777 as a big win symbol