The term "order Batoidei" refers to a group of fish that are characterized by their flattened bodies and wing-like fins. However, there are several synonyms for this term that can be used interchangeably, including "Rajiformes," "skates and rays," and "elasmobranchs." These synonyms are often used in scientific research to describe different subgroups within the Batoidei order, such as the Rajidae family of skates or the Myliobatidae family of rays. Regardless of the terminology used, all members of the Batoidei order are fascinating creatures that have evolved unique adaptations for their aquatic environments.