Supporters of ousted Egyptian president Mohamed Morsi raise up posters with the four finger symbol during a demonstration against the military backed government in the Egyptian capital Cairo, on September 13, 2013. Thousands of Morsi supporters rallied in Cairo after Friday prayers chanting angry slogans against the military, with clashes reported elsewhere in Egypt. The four finger symbol, known as 'Rabaa', meaning four in Arabic, is used to remember those killed in the crackdown on the Rabaa al-Adawiya protest camp in Cairo in July.