What is the role of a "Publisher" in a sphere?

A member of the @@Publisher group shares the following rights with sphere administrators (@@Admin group):

Messages

• Pin messages 
• Force the delivery of a new email notification to all members (Accessible by clicking the "+" in the main message writing field)
  

Sphere settings

• Edit an information banner
• Edit a sphere charter
• Modify "Tools" settings (calendar, document box, video conference, etc.)
• Modify "Notifications" settings