Multistable refers to a phenomenon in which a system can exist in multiple stable states. There are numerous synonyms for this term, including bistable, double-stable, and two-stable. Other similar terms include polystable, which refers to systems that have more than two stable states, and metamorphic, which describes systems that can transition between states. In engineering, the term "snap action" is often used to refer to multistable systems, as they can switch between states abruptly, like a snapping action. No matter what term is used, the concept of multistability is essential in understanding complex systems and controlling their behavior.