Iron, when used metaphorically, refers to certain traits of the metal iron. Used as an adjective and sometimes as a noun, it refers to something stern, harsh, strong, unyielding, inflexible, rigid, sturdy, strong, robust, hard.[1][2][3]
"Iron, Master of Them All" from the University of Iowa Museum of Art and Project for the Advanced Study of Art and Life in Africa, discussing various metaphors (associated with iron) in African cultures.
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