Image: Triple Goddess symbol
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.
credit: AnonMoos / Wikimedia Commons