context: The colors of the flag are traditional for the flags of the Arab countries. Two stars originally symbolized Egypt and Syria, two countries that entered the United Arab Republic. They are now preserved to demonstrate Syria's commitment to Arab unity. Green is the color of the Fatimids, white is the Umayyad, black is the Abbasid and red is the color of the Hashimite dynasty (it was added when Sheriff Hussein joined the Arab uprising in 1916).
question: What does black mean on the flag of Syria?
answers.text: Abbasid