The "best example" of a concept (or average family member), which is often a non-existent composite example, is known as a:

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The best example of a concept or average family member is known as a prototype. This composite example is based on the most typical and salient features of the concept or family member, and may not actually exist in reality. The term "prototype" is commonly used in cognitive psychology and linguistics to describe how people organize and classify information in their minds.

The "Best Example" of a Concept (Or Average Family Member)