!!! Overview
[{$pagename}] refers to attributes that are the Reciprocal of each other.

A [member] on a group is a [{$pagename}] of the [groupMembership] or [MemberOf] attribute on the user entry.

[{$pagename}] are typically used as a convenience or to provide a linkage from one entry to another which represents a relationship between the two entries.!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]