What does the hand symbol mean when you put up three fingers and your point finger down and your thumb up to?

The hand symbol you're describing, with three fingers raised and the index finger pointing down while the thumb is up, often represents the letter "Y" in American Sign Language (ASL). It can also be seen in various contexts, including sports or social movements, where it may symbolize unity or support. The specific meaning can vary based on the context in which it is used.