The right side of the System bar displays icons indicating that you’ve received notifications, the current time, and icons indicating the tablet’s status.
If you have more notifications than can fit in the System bar, a plus icon prompts you to open the Notifications panel to view them all. See Managing notifications.
Status icons indicate the status of your tablet at the right edge of the System bar and in the Status Details panel (which opens if you touch the time).
To learn more about the different kinds of mobile networks, see Connecting to networks and devices.
Network status icons turn blue if you have a Google Account added to your tablet and the tablet is connected to Google services, for syncing your Gmail, Calendar events, contacts, for backing up your settings, and so on. If you don’t have a Google Account or if, for example, you’re connected to a Wi-Fi network that is not connected to the Internet, the network icons are gray.
Notification icons indicate that you’ve received a notification from the system or form an application. They appear to the left of the time in the System bar. See Managing notifications for information about responding to these notifications. In addition these icons, apps you install on your tablet may use their own notification icons.