Workflow Launcher 

Every workflow also has a launcher. This is the user who launches the job. The workflow launcher has no special privileges, but can be selected to be the workflow owner, to perform the task, or to receive email notification.

The special user [Launcher] often appears in drop-down lists of users within workflow step properties and refers to the workflow launcher. In addition, the special user [Anyone] sometimes appears in the drop-down lists and refers to any assignee user.