What is rex?

There are several different things that can be referred to as "Rex," so here is some information about a few different subjects:

1. T-Rex: The T-Rex, or Tyrannosaurus Rex, was one of the largest carnivorous dinosaurs to ever roam the Earth. It lived during the late Cretaceous period, around 68-66 million years ago. T-Rex had powerful jaws and sharp teeth, making it a formidable predator.
2. Rex breed: Rex is also a breed of domestic rabbit known for its unique coat that lacks the long guard hairs found in most rabbits. The Rex breed was first developed in France in the early 1900s and has since become popular worldwide.
3. Rex Tillerson: Rex Tillerson is an American businessman and former government official who served as the 69th United States Secretary of State under President Donald Trump from 2017 to 2018. Tillerson previously worked as the CEO of ExxonMobil, one of the world's largest oil and gas companies.
4. Rex: Rex is also a common male given name of Latin origin, meaning "king" or "ruler." It has been used as a name for various fictional and real-life characters, as well as for organizations and companies.