What are the schema objects that groups logically related PL/SQL types and variables using PL/SQL?

What are the schema objects that groups logically related PL/SQL types

1.	What are the schema objects that groups logically related PL/SQL types and variables using PL/SQL?
Answer» With NOT INSTANTIABLE clause in PL/SQL, you can declare an abstract object. To WORK with it, you need to CREATE a SUBTYPE of such objects to USE its functionalities.