The eleventh day of the eleventh month means many things to many people.
In the United States November 11th is Veterans Day, it is the day to honor America's veterans for their patriotism, love of country, and willingness to serve and sacrifice.
While in America we honor the living veterans, the rest of the world honor the fallen. In many countries today is Remembrance Day or Armistice Day. (In Poland and Angola it is Independence Day)
The 11th of November marks the end of World War I.
On the eleventh hour, of the eleventh day, of the eleventh month, the guns fell silent.