It is normally a noun. An Entity would have one or many attributes. It may be physical object (. person) event (. appointment) concept (. order). descriptor (describe properties of the entity, . lastname of the person) ATTRIBUTE A property of an entity identifier (uniquely distinguish entity instances - primary key in relational context) composite (a group of attributes used as a single attribute) Describes the relationship between entities. Typically expressed in verbs (. has). There are no well defined standards of the EER notation
