Chelonians are a group of reptiles that includes turtles, tortoises, and terrapins. There are several synonyms for chelonians, including Testudines, Testudinata, and Chelonia. Testudines is derived from the Latin word "testudo," which means "shield." Testudinata comes from the Latin word "testudo" and the Greek word "natos," which means "born." Chelonia is derived from the Greek word "chelone," which means "tortoise." These synonyms are often used interchangeably to describe this unique group of animals. With their distinctive shells and slow movements, chelonians have captured the imagination of people worldwide and have become popular pets and symbols of longevity and wisdom.