The number 7 is seen as lucky in slots and pop culture partly because classic...

https://www.bookmarkpage.win/the-number-7-is-seen-as-lucky-in-slots-and-pop-culture-partly-because-classic

The number 7 is seen as lucky in slots and pop culture partly because classic slot machines often feature 777 as a big win symbol. It also connects to the idea of a seven-day week, symbolizing completeness and good fortune