Report's header and titles can accept variables. This should help easily identify content of the report.
The syntax to include variables in the report is,
Steps to include variables,
1) Create a list adding some required values.
2) Create a rule defining variable as follows and here we have defined a variable ‘VAR’,
3) While scheduling report mention the List and Variable used in the defined Rule,
4) Add the same variable name in the report header title as below syntax and schedule,
5) Go to view schedules reports and click this report and we can see VAR name is replaced by its value,