“Significant 11s punctuate modern history. The First World War, after consuming some twenty million lives, ended with an armistice on the 11th hour of the 11th day of the 11th month. Eleven is also strongly associated with American and rocket power, for it was Apollo 11 from which Neil Armstrong made the first landing on the moon, The attack on the World Trade Centre was made by American Airlines flight 11, on 11 September 2001, an event now chronicled throughout the world as 9/11. Eleven also has strong numerological connotations as the union of 5 and 6 in the works of Pythagoras and his many followers.”
Excerpted from: Rogerson, Barnaby. Rogerson’s Book of Numbers: The Culture of Numbers–from 1,001 Nights to the Seven Wonders of the World. New York: Picador, 2013.