One can see various “Icons” in Windows Phone, which appear on the top status bar from time to time and not all look familiar or are known. In fact it is one of the most commonly asked queries in various forums. The below screenshot tries to explain many of them.
Note: This topic is about Windows Phone 8.1. If your phone is running Windows Phone 8, some options and icons may look a little different.
But these icons may also appear bit differently depending upon various factors. A detailed info about most of these icons or symbols is given below,