Triple Goddess Symbol, composed of waxing crescent, full moon, and waning crescent (outlined version).  Sometimes the crescents are tilted up a little to simulate the appearance of a young waxing moon above the horizon after just after sunset, and of an old waning moon above the horizon just before sunrise.  The symbol is sometimes combined with a pentagram to express a more general Neopaganism.  See also Image:Triple_Goddess_Symbol_Filled.svg for a monochromatic solid version, or Image:Triple-Goddess-Waxing-Full-Waning-Symbol-multicolored.svg for a version using symbolic colors.  See Image:Three-Crescents-Diane-Poitiers.svg for a different crescent symbol.
Own work - SVG version of image Image:Triple-Goddess-Waxing-Full-Waning-Symbol.png . Converted from the following PostScript code:

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AnonMoos