Here is where the super handy legend hides for all the icons!
Added: Bulk uploaded or manually added.
Consented: Subscribed via a form.
Confirmation: Double opted in.
Unsubscribed: Unsubscribed themselves or manually in the system. Won't be sent to and are added to the accounts unsubscriber list.
Deactivated: Manually deactivated or auto-deactivated by the system due to bounces. Will not be included in sends.
Updated from Eventbrite: Automatically imported from the Eventbrite integration.
The envelope icons reflect the status of an email address and the speech bubbles reflect the status of an SMS address.