Only Knowing Best Known Case

Suggested by the discussion at UniformResourceIdentifier, this is a name for the unfortunate tendency to take the best known instance of a category, and assume that it is the whole story.

On that page, some contributors assumed that the familiar URLs were the entirety of URIs. -- RobertField

Other examples of only including the best known case can go here:

You mean like knowing facial tissues as Kleenex?

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