Priority Zero refers to urgent and critical tasks that require immediate attention. Synonyms for priority zero include top priority, emergency, crisis, priority one, high priority, and must-do tasks. These terms are often used in a work or business setting to indicate tasks that are highly important and need to be completed quickly. Priority zero tasks could range from a technical issue that needs to be resolved to a customer complaint that requires immediate attention. Having a clear understanding of priority zero tasks can help individuals and businesses make strategic decisions and ensure that critical tasks are completed on time.