Rex or REX may refer to: Rex (title) (Latin: king, ruler, monarch), a royal title. King of Rome (Latin: Rex Romae), chief magistrate of the Roman Kingdom. Animals. Dogs. Rex (Ronald Reagan's dog) Rex (search and rescue dog), a dog that received a 1945 Dickin Medal for bravery. Other animals. -rex, a taxonomic suffix used to describe certain large animals. Tyrannosaurus rex, a large predatory cretaceous dinosaur. Rex (horse) or Rex the Wonder Horse, star of 15 Hollywood motion pictures. Rex rabbit, a breed of rabbit. Rex mutation, a type of mutation affecting the fur of the rex rabbit.
https://en.wikipedia.org/wiki/Rex