!!! Overview
[{$pagename}]  is a computer programming principle that states that every module or class should have responsibility over a single part of the functionality provided by the [application], and that responsibility should be entirely encapsulated by the class. 

[{$pagename}] implies a single [entity] should be narrowly aligned with that responsibility. Robert C. Martin expresses the principle as, "A class should have only one reason to change".!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]