Gambling and luck 777 is used on most slot machines in the 6️⃣ United States to identify a jackpot. As it is considered a lucky number, banknotes with a serial number containing 777 6️⃣ tend to be valued by collectors and numismatists.
What does 777 mean in the casino? - Quora
To play 777, follow the 6️⃣ HOW TO WIN instructions: Reveal a set of any three like-colored "SEVEN" symbols in a row to win 6️⃣ the corresponding prize for that row. Reveal two sets of three like "SEVEN" symbols in a row to win double 6️⃣ the prize.