I have a necklace of a golden quill with crystal inkwell -- I've had it forever: my parents gave it to me when I was younger because I liked to write. Once I joined AXiD I realized that it's quite appropriate for that, too -- just another sign that I was meant to be an Alpha Xi!

I would notice it if I saw it on someone else and wonder if she was an Alpha Xi, but probably wouldn't ask because plenty of other people could have it without intending to show affiliation.
pic of the necklace charm: