A property is a named value that is associated with a definition of an analytic workspace object. You can name, create, and assign properties to an object using an OLAP DML PROPERTY command.
Properties that begin with a $ (dollar sign) are recognized by Oracle OLAP as system properties. You cannot create system properties; however, in some cases you can assign system properties to objects. In particular, you can assign system properties that interact with the OLAP DML.