(rhetoric) The noun "irony" represents the quality of a statement that may mean something different from what is written literally, often used humorously.

Dramatic irony: a theatrical effect in which the meaning of a situation, or some incongruity in the plot, is understood by the audience, but not by the characters in the play.

Socratic irony: ignorance feigned for the purpose of confounding or provoking an antagonist.

(informal) Contradiction between circumstances and expectations; condition contrary to what might be expected.

Of or pertaining to the metal iron.