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"French lore holds that the three petals of the iris symbolize Faith, Wisdom and Valor. The iris has been adopted by NAMI to represent these same traits reflected by so many struggling wih serious mental illnesses."
The iris as a whole may likewise represent the dual attributes of "Hope and Courage." Perhaps therein lie the (heraldic?) colors' dichotomy - and that blue and gold may be common colors for the iris.
Enjoy the qualities of the iris in your advocacy for mental health