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

https://rileysinspiringchat.quillnesty.com/posts/what-does-seven-mean-in-the-bible-exploring-its-spiritual-and-cultural-significance

The number 7 is seen as lucky in slots and pop culture because it often symbolizes good fortune and success. Classic slot reels feature the “777” combination, which usually means a big win