Exemplar

Something that serves as an example; typical or representative of its type; especially an example that is worthy of imitation; a model or ideal. As opposed to an exemplum, an exemplar can be both an ideal model as well as one in a range of examples in a group. Art educators, limited in the number and variety of examples of art images they can show to students, seek exemplars along with pieces which are epitome of their types.Also see archetype, avatar, and realia.