Crescent is a geometrical form resembling the moon in its first quarter, and used as a charge in heraldry. It is perhaps better known as the symbol of the Ottoman Turks and a symbol of Islam. The crescent as an emblem is of very high antiquity, being that of the Greek goddess Artemis or Diana. It is found on medals of many ancient cities, particularly of Byzantium, from whence it is supposed to have been borrowed by the Ottomans. The crescent has given name to a Turkish order of knighthood from the form of the badge, instituted by Selim, sultan of Turkey, in 1801. Research Crescent