Wall Street became associated with business and finance after 24 traders signed an agreement to trade stocks with each other and begin the New York Stock and Exchange Board. The agreement was signed under a buttonwood (sycamore) tree in Wall Street and is known as the Buttonwood Agreement. The New York Stock and Exchange Board later became known as the New York Stock Exchange (NYSE) and is situated on Broad Street, just off a corner of Wall Street. Wall Street was originally called "de Waal Straat", named by the Dutch when New York was a Dutch Settlement known as New Amsterdam. It is believed that it was named Wall Street because of a wall built by the Dutch to protect the area from the British.