[A black flag was used by Muhammad to represent his religion.
Islam has not symbolized itself with any particular object or symbol, but due to political reasons a flag was required to give a standard for Muslims, especially during the wars. The Prophet used flags of different colors in different Ghazwat (campaigns commanded by the Prophet) and Saraya (campaign commanded by any Sahabi). The major flag of the Prophet was known as "Al- Uqaab", it was pure black with and without symbol or marking. Its name and color was derived from Quraish's national flag.]