The stock market opening bell is the brass bell that rings at the New York Stock Exchange to mark the opening of the day's trading, according to the Exchange. The NYSE has four trading areas, each with its own bell. One control panel rings the bells simultaneously.
When continuous trading began in the 1870s, the Exchange used a Chinese gong as its bell. In 1903, the NYSE moved to its present location and replaced the gong with a large, electronically operated brass bell crafted by the G. S. Edwards Company of Norwalk, Connecticut. When the NYSE wanted to reproduce the bells in the 1980s, the company brought employees out of retirement to manufacture the bells currently used. The bell is struck nine times in a 3-second period, notes the NYSE.