Unlike in the Object-Oriented world that a "class" is a template of an "object" and an "object" is an instance of a "class", in BEE terminology, "class" is "object" and "object" is "class".  Object templates are represented by their constructor functions and therefore are not called "class" as in the proper Object-Oriented language.

To differentiate the "classes" that represent objects and those defined by the system, you can call the former "object classes" and the latter "system classes" (or just "classes").  For details, please refer to the "BEE Variable Name" Section.