When an entity participates in multiple relationships and it isn't convenient to place the relationships close to each other, a copy of the entity may be portrayed with a diagonal slash in the bottom right corner of the entity and no attributes attached to the entity copy.

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Quizplus · Accepted Answer

This is a common practice in ER diagrams to avoid clutter and maintain clarity when an entity is involved in multiple relationships. The diagonal slash indicates that it is a duplicate representation of the same entity.

When an Entity Participates in Multiple Relationships and It Isn't