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

https://weekly-wiki.win/index.php/Why_Is_8_Lucky_in_Some_Cultures_but_7_Is_Lucky_in_Others%3F

The number 7 is lucky in slots and pop culture because it’s long been seen as special and positive. Classic slot machines often show triple 7s (777) as the top win