In Baltic lore, each of the Old Gods has his or her own sign.
For the Sun, it's the Sun Wheel. For the Moon, the Crescent.
Fire is the Fire Cross, the swastika, Thunder, the Thunder Cross, or compound swastika.
The Winds, since there are four of them, have the Cross, Heaven the Mountain. (How else would you draw a picture of the sky?)
But what about Earth?
My teacher, Tony Kelly, of the Pagan Movement in Britain and Ireland, used to say, “If we know anything at all about Earth, we know that she's Mother.”
At the time, as a good, doctrinaire second wave feminist, I found this statement reductionist and objectionable.
Since then, I've changed my mind.