shape that resembles the moon before it reaches the first-quarter lunar phase, or after it passes the last quarter.
In art and symbolism, a crescent is generally the shape produced when a circular disk has a segment of another circle removed from its edge, so that what remains is a shape enclosed by two circular arcs of different diameters which intersect at two points (usually in such a manner that the enclosed shape does not include the center of the original circle).
The crescent was long used as the symbol of Byzantium. Now it is the main symbol for the religion Islam.
The English Wiktionary has a dictionary definition (meanings of a word) for: crescent