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

https://brookssimpressiveop-ed.wordcanopy.com/posts/what-are-the-seven-dwarfs-and-why-seven

The number 7 is seen as lucky in slots and pop culture because it often represents good fortune and completeness. Classic slot machines use 777 as a jackpot symbol, linking to the idea that seven brings luck