An Islamic flag is a flag either representing an Islamic denomination or religious order, state, civil society, military force or other entity associated with Islam. Islamic flags have a distinct history due to the Islamic prescription on aniconism, making particular colours, inscriptions or symbols such as crescent-and-star popular choices. Since the time of the Islamic prophet Muhammad, flags with certain colours were associated with Islam according to the traditions. Since then, historical Caliphates, modern nation states, certain denominations as well as religious movements have adopted flags to symbolize their Islamic identity.