Does anyone knows what this is?

Hello guys! Recently I’ve the opportunity to go to Japan, and I bought some action figures from our beloved Dark Souls and inside the pack of some figures I received this brooch which I have no ideia of its meaning. Does anyone knows what it is? Apparently it’s not for sale and I couldn’t recognize it from the game or lore… (looks like an ear to me lol)

Thanks!

Dont you dare go hollow.