When creating a Runbook a Type must be aligned. This type can then be used to identify  what the Runbook is being used for. From the dropdown you have 3 potential options to choose from - Planned Change, Disaster Recovery and Service Recovery.

The identification of these types allows for Runbooks to be created ahead of potential Disaster Recovery scenarios or Service Recovery scenarios.

Once the Type has been given to the Runbook it will be listed on the List Runbooks screen, allowing  you to filter into Runbooks of certain types.