777 tattoo means luck. 777 is a natural number between 776 and 778. It symbolizes good luck. "777" has different meanings in different fields, such as games, lottery tickets, and airplanes.
Boeing 777 is a long-range twin engine wide body airliner manufactured by Boeing company of the United States. It is the largest twin engine wide body airliner in the world at present. When Boeing 777 first flew, it was the largest twin engine jet in the history of civil aviation.
In addition, 777 usually refers to winning a slot machine, so it symbolizes good luck and luck. If you spend $10 on the game and hit 777, the odds of 777 in the table are 100 times, then you can get $1000.