The number 7 is seen as lucky in slots and pop culture because it has a long...

https://www.primary-bookmarks.win/the-number-7-is-seen-as-lucky-in-slots-and-pop-culture-because-it-has-a-long-1

The number 7 is seen as lucky in slots and pop culture because it has a long history of positive meaning. Classic slot machines often feature the 777 combo as a jackpot symbol