As an adult, Oedipus still limps from a childhood injury to his ankles. This limp, and his very name—which means "swollen ankle," and which was given to him because of a childhood ankle injury—are clues to his own identity that Oedipus fails to notice. As such, Oedipus's ankles become symbols of his fate. His ankles, literally, are the marks of that fate.
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