Signs of Things to Come is a phrase that refers to indications or warnings of events that will happen in the future. OMENS, HERALDS, and PORTENTS are all words used to describe such signs. An omen is a sign or warning of something to come, usually of a bad event. A herald is someone who announces or proclaims something, often a warning or announcement of an important event. A portent is a sign or warning of something to come, usually of a significant event.