conch    

put this in the comments of the oracle's beasty form art post but here's all the symbolism

snake fangs (and also snake tounge but its. in their mouth.) - rick riordan hasn't failed me yet, so i'm pretty sure snakes were a symbol of oracle-ness coming from caves n stuff in ancient greek mythology
mistletoe - in norse mythology, loki made hodur kill baldur (god of truth and light) with an arrow made of mistletoe because it was the only thing frigg didn't beg to spare baldur. also the position is meant to cover the private part areas because of that one part of genesis where adam and eve ate the apple and then covered those parts in leaves or something like that because they were ashamed of being naked
goat legs - the devil is usually depicted with goat legs (also scapegoat stuff)
crow tail - idk where it originated but my 6th grade writing teacher said that seeing a crow when you woke up meant something bad was going to happen that day so uhh yeah

there's two more but they're spoilery of the plot twist lol- though i can say that the two crystals hanging from the oracle's hair are meant to represent them and tdo (the green and yellow one respectively), and the crown is meant to resemble the divine one's halo