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

https://shed-wiki.win/index.php/What_Does_a_Red_7_Mean_Compared_to_a_Blue_7_in_Slots%3F

The number 7 is seen as lucky in slots and pop culture because it often appears as the winning 777 combo on classic reels. It’s tied to positive ideas like the seven-day week, symbolizing completeness