What does the serial number on the fifty and hundred dollar bill mean?

The serial number on fifty and hundred dollar bills is a unique identifier that helps track and authenticate each note. It consists of a combination of letters and numbers, indicating the series year, the Federal Reserve Bank that issued the note, and a unique sequence number for that specific bill. This system aids in preventing counterfeiting and helps the U.S. Treasury manage the currency supply. Each bill's serial number is distinct, ensuring that no two bills share the same identifier.