The flag of Jordan, officially adopted on 16 April 1928, is based on the flag of the Arab Revolt against the Ottoman Empire during World War I.
The Jordanian flag consists of horizontal black, white, and green bands that are connected by a red chevron. The colors stand are the Pan-Arab Colors, representing the Abbasid (black band), Umayyad (white band), and Fatimid (green band) caliphates. The red chevron is for the Hashemite dynasty, and the Arab Revolt.
The seven-pointed star stands for the seven verses of the first surah in the Qur’an, and also stands for the unity of the Arab peoples. Some believe it also refers to the seven hills on which Amman, the capital, was built.
In addition to the bands and chevron, a white star with seven points is featured on the hoist side of the red chevron. The seven points symbolize the seven verses of Islamic belief, which is mentioned at the beginning of Qur’an. The seven points represent faith in one God, humanity, humility, national spirit, virtue, social justice, and aspiration. The star also stands for the unity of the Arab nation. Wikipedia