Final answer:
An omen or sign, such as a harbinger, is something that foreshadows or predicts future events.
Step-by-step explanation:
An omen or sign is a **harbinger** of future events. It is something that foreshadows or predicts what will happen in the future. For example, in literature, a dark and stormy sky can be an omen of bad things to come. Similarly, in real life, seeing a black cat crossing your path may be considered an omen of bad luck. Omen or sign is not applicable to the subjects of Mathematics, History, Biology, Chemistry, Physics, Social Studies, Advanced Placement (AP), SAT, Geography, Health, Arts, Business, Computers and Technology, French, German, Spanish, World Languages, Medicine, Law, Engineering.
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