New York CNN —The New York Stock Exchange opens every workday morning at 9:30 am ET with the fast-paced bang-clang of a gleaming brass bell. The stock exchange, the largest in the world by market capitalization, has opened with sonic fanfare for more than 150 years. From Wall Street to the Nasdaq Exchange in Times Square to the Chicago Board Options Exchange, loud, ringing bells bookend each trading session. Stock exchanges say that the bell ringing remains both a critical guide and a ceremony that celebrates the market’s resilience through devastating lows and exuberant highs. The stock exchange had been closed since two hijacked commercial airliners were deliberately crashed into the World Trade Center's twin towers on September 11.

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