Because of her creation of the stars, Varda was the dearest of the Valar to the elves, who called to her for aid from Middle-earth. The Valar are divine beings below a greater, more ultimate Creator, Ilúvatar. Thus some equate the Valar of Middle-earth with saints and angels; thus Varda, in her role as the most loved and prayed-to Vala, may be an equivalent of the Virgin Mary in Tolkien's own Catholic faith.
A Yoni is one of the most primeval forms of the goddess. She represents the origin of life, the womb or “secred temple” in Hindu philosophy, the creative force of the Shakti/Devi. Behind her you can see the moon phases which represent the female fertility. In this case the antlers contribute to convey the idea of the fertile uterus, From the neolithic period and before, the female archetype is frequently associated with horns and bucraniums.