Closing Bell can refer to two CNBC programs, the original Closing Bell on CNBC (which debuted on February 4, 2002), and European Closing Bell on CNBC Europe.The show is named after the bell that is rung to signify the end of a trading session on the New York Stock Exchange which occurs at 4:00 pm EST. Many exchanges used to signify end of trading with a gong or bell when they were operated on a open outcry basis.