In ER diagrams, dashed ellipses are used to denote-

Explanation

Dashed Ellipse is used to denote the derived attribute Below are the Symbols with their description used in ER Model. Entity Symbol Description Strong Entity has its own attribute. They will also have a primary key, distinguishing each occurrence of the entity. Weak entities depend on some other entity type Associative entities relate the instances of several entity types Relationships are associations between or among entities. Weak Relationships are connections between a weak entity and its owner. Attributes are characteristics of an entity, a many-to-many relationship, or a one-to-one relationship. Multivalued attributes are those that are can take on more than one value. Derived attributes are attributes whose value can be calculated from related attribute values.