Final answer:
Omens are signs of something that will happen in the future. In literature, omens are often used to foreshadow future events.
Step-by-step explanation:
Signs of something that will happen in the future are known as Omens. Omens are events or symbols that are believed to be a prediction or indication of a future event. In literature, omens are often used to create suspense and foreshadow future events. For example, in the play Antigone, the warning given by Tiriesias to Creon is an omen of impending disaster.