For example, in Shakespeare's play "Hamlet," the ghost of Hamlet's father could be interpreted as a symbol of Hamlet's inner turmoil and sense of duty to avenge his father's death. In Arthur Miller's play "The Crucible," the Salem witch trials could be interpreted as a symbol of the McCarthy hearings and the Red Scare in the United States.
Symbols can add richness and complexity to a play, and can help to create a more memorable and impactful theatrical experience.