Triple Goddess Symbol, composed of waxing crescent, full moon, and waning crescent (colored version).  Uses symbolic colors according to Robert Graves:

"...the New Moon is the white goddess of birth and growth; the Full Moon, the red goddess of love and battle; the Old Moon, the black goddess of death and divination."
See Image:Triple-Goddess-Waxing-Full-Waning-Symbol.svg for a further explanation of the general symbol, or Image:Triple_Goddess_Symbol_Filled.svg for a monochromatic version.  See Image:Three-Crescents-Diane-Poitiers.svg for a different crescent symbol.
Own work -- SVG version of Image:Triple-Goddess-Waxing-Full-Waning-Symbol-multicolored.png . Converted from the following PostScript code:

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AnonMoos