Understand the notification icons on Windows Phone
Most OS of Handheld devices use the top most section on the display area for notification. The same is the case with Windows Phone. This section shows network connectivity/signal strength, Battery status, Time etc.
Some of these notification icons are temporary and some of them are permanent giving users an indication of the behavior or giving users information of their device. The following picture gives you more information about your device.
More details can be found here.
How many icons were you aware of? Do let us know.