The symbol for Islam is actually the Star and Crescent.
The star and crescent is the best-known symbol used to represent Islam. It features prominently on the flags of many countries in the Islamic world, notably Turkey and Pakistan.
Surprisingly, the symbol is not Muslim in origin. Rather, it was a polytheistic icon adopted during the spread of Islam, and its use today is sometimes controversial in the Muslim world. The crescent and star are often said to be Islamic symbols, but historians say that they were the insignia of the Ottoman Empire, not of Islam as a whole.