shape that resembles the moon in the first quarter lunar phase

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).

An example of an artistic crescent — in this case a large circle with a smaller one removed.
An astronomically correct crescent shape (in blue), complemented by a gibbous shape.
Statue of the Crescent in one of the squares.

The crescent was long used as the symbol of Byzantium. Now it is the main symbol for the religion Islam.

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The English Wiktionary has a dictionary definition (meanings of a word) for: crescent