A class is a collection whose members either fall under a predicate or are classified by a rule.
Hence, while a set can be extensionally defined only by its elements, a class has also an intensional dimension that unites its members.
When the term 'class' is applied so that it includes those sets whose elements are intended to be collected without a common predicate or rule, the distinction can be indicated by calling such sets "improper class."
He is a token (instance) not member of the type (kind), human beings.
The terminology is that types (or kinds) have tokens (or instances) while classes have members.