Well,

on her! (Just kidding, girls.) If its true that the circle and 14 pearls are our symbols, then IMHO we haven't done a very good job of getting the word out.
Oh well. I suppose there's nothing to stop you from using an acorn if you like it (i.e, a local thing) so long as you're not actively harming our Ritual. Far be it from me to ruin anything our Founders wanted for us.