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

https://wiki-velo.win/index.php/Why_Do_Fruit_Symbols_Still_Show_Up_in_Online_Slots%3F

The number 7 is often seen as lucky in slots and pop culture because it appears on classic reels like the 777 jackpot combo. Its lucky vibe partly comes from the seven-day week, a familiar cycle that feels complete and balanced