the sign of Remembrance Day...

http://en.wikipedia.org/wiki/Remembrance_Day

http://en.wikipedia.org/wiki/Poppy

The poppy's significance to Remembrance Day is a result of Canadian military physician John McCrae's poem In Flanders Fields. The poppy emblem was chosen because of the poppies that bloomed across some of the worst battlefields of Flanders in World War I, their red colour an appropriate symbol for the bloodshed of trench warfare. An American YMCA Overseas War Secretaries employee, Moina Michael, was inspired to make 25 silk poppies based on McCrae's poem, which she distributed to attendees of the YMCA Overseas War Secretaries' ConferenceShe then made an effort to have the poppy adopted as a national symbol of remembrance, and succeeded in having the National American Legion Conference adopt it two years later. At this conference, a Frenchwoman, Anna E. Guérin, was inspired to introduce the widely used artificial poppies given out today. In 1921 she sent her poppy sellers to London, England, where they were adopted by Field Marshall Douglas Haig, a founder of the Royal British Legion, as well as by veterans' groups in Canada, Australia and New Zealand.
Text from Wikipedia.