Does a $3 bill exist?

I'm curious, have you ever come across a $3 bill in your financial endeavors? I've heard some intriguing tales about its existence, but I'm not entirely convinced. It's quite an unusual denomination, isn't it? Could you shed some light on whether a $3 bill is indeed a real entity or merely a figment of some people's imagination? It would be fascinating to learn more about its history and authenticity, if it does indeed exist.