The "Closing Bell" refers to the signal that marks the end of the trading day on stock exchanges, such as the New York Stock Exchange and the NASDAQ. It typically occurs at 4:00 PM Eastern Time and indicates that no further trades can be executed for that day. The closing bell is often accompanied by a ceremonial ringing, which can involve notable figures from various industries. The closing bell is significant for investors and traders as it provides a final snapshot of the market's performance for the day. It helps in assessing the day's trading activity and can influence market sentiment going into the next trading session.