World diabetes day is November 14 – the birthday of Frederick Banting, whose work with Charles Best led to the discovery of insulin in 1921. The blue circle is the international symbol for diabetes. It was created in 2006 to support a campaign for a United Nations Resolution of Diabetes as a response to the growing global diabetes pandemic. The circle symbolizes positivity, unity, and strength and the blue reflects the color of the sky and the flag of the United Nations.