Red Crescent

1 :  a red crescent on a white background used in Islamic countries as the emblem of the International Federation of Red Cross and Red Crescent Societies

2 :  a humanitarian aid society in an Islamic country that is a member of the International Federation of Red Cross and Red Crescent Societies and has adopted a white flag with a red crescent as its symbol of neutrality; also :  such aid societies thought of collectively — compare red cross