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9-11 (or 9/11) stands for the date of the 9th month, 11th day of the year 2001 when the attacks on the U.S. occurred. 9-1-1 is the emergency telephone number used in the United States to call for police, fire or ambulance assistance. It is believed that the terrorists responsible for planning the September 11, 2001 attacks chose the date of 9/11/01 because of the 9-1-1 emergency number, but the date is what is used to identify this tragic, historic event.

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13y ago

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