What does 777 mean in the casino? - Quora

To play 777, follow the HOW TO WIN  instructions: Reveal 🤶 a set of any three like-colored "SEVEN" symbols in a row to win the corresponding prize for that row. Reveal 🤶 two sets of three like "SEVEN" symbols in a row to win double the prize.

A victorious spin and a sizable 🤶 payoff are both indicated by the combination of the 777 slot machine symbols. The number combination is used by slot 🤶 machines to show a winning spin and to persuade players to feel lucky.

777 Slot Symbol  Origins, Meaning & 🤶 Tips - 1883 Magazine