Danger signals are important in alerting people of potential hazards. However, using the same term repeatedly can become monotonous. There are several synonyms for 'danger signal' that can be used to add variety and clarity to your discussion. Words such as 'warning', 'alert', and 'caution' can be used to imply danger without explicitly stating it. Other options like 'menace', 'threat', and 'peril' can be utilized if the situation is severe. Furthermore, phrases like 'red flag', 'yellow light', and 'wake-up call' can be used to be more figurative and creative. These synonyms can help you convey a sense of urgency to your audience.