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

https://codysdui093.iamarrows.com/what-does-history-com-say-about-famous-numbers-in-pop-culture

The number 7 is seen as lucky in slots and pop culture because it often represents good fortune and completion. Classic slot machines use the “777” combo as a big win symbol, drawing from the idea of the seven-day week, which feels complete and balanced