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777 is used on most slot machines in the United States to 🧬 identify a jackpot. As it is considered a lucky number, banknotes with a serial number containing 777 tend to be 🧬 valued by collectors and numismatists. The US Mint and the Bureau of Engraving and Printing sells uncirculated 777 R$1 bills 🧬 for this reason.

777 (number) - Wikipedia

The number 777 is often seen on slot machines, and it's widely recognized as a 🧬 symbol of luck and fortune. This association comes from various cultural and historical contexts where the number 7 is considered 🧬 lucky.

What does 777 mean in the casino? - Quora