Ottoman Empire;
It wasn’t until the Ottoman Empire that the crescent moon and star became affiliated with the Muslim world. When the Turks conquered Constantinople (Istanbul) in 1453 C.E., they adopted the city’s existing flag and symbol. Legend holds that the founder of the Ottoman Empire, Osman, had a dream in which the crescent moon stretched from one end of the earth to the other. Taking this as a good omen, he chose to keep the crescent and make it the symbol of his dynasty. There is speculation that the five points on the star represent the five pillars of Islam, but this is pure conjecture. The five points were not standard on the Ottoman flags, and are still not standard on flags used in the Muslim world today.
For hundreds of years, the Ottoman Empire ruled over the Muslim world. After centuries of battle with Christian Europe, it is understandable how the symbols of this empire became linked in people’s minds with the faith of Islam as a whole. The heritage of the symbols, however, really is based on links to the Ottoman empire, not the faith of Islam itself.
Accepted Symbol of Islam?