ISIS' flag features white text on a black background, along with a white circle with black text inside of it. In fact, ISIS' flag may have been designed to appeal to a wider Muslim audience.
The caliphate remains geographically isolated, limited to small parts of northern Iraq and Syria currently, but the black flag has become recognizable as a symbol of the terrorist group around the world. ISIS, the terrorist group also known as the Islamic State, has tried to legitimize its existence by declaring a territory - what it calls a 'caliphate' - and raising a flag in the name of its extremist beliefs.
