[class.unique] Name classes with common names uniquely

Sometimes the most logical name for a class is already widely used in many libraries or is a word that is almost a reserved word like “Date”.  To avoid confusion, use a more unique name if possible so when it is referenced, there is no danger of it being confused with similar classes in Java or in library JAR files.

For example, many libraries and frameworks have a Config class.  It is tempting to name an application's configuration class the same, as follows:

Instead, uniquify the classname.  

Other examples where more uniqueness helped comprehension:

Exception: This method has a tendency to muddy data models that map directly to databases.  Whilst Customer is a common classname, it makes sense to keep it matching the table name.