Please help if you're good-ish with symbols and/or read Last Sacrifice by Richelle Mead.?

So for school, I need to analyze my independent reading book. The book I chose was Last Sacrifice (book 6 of the Vampire Academy series) by Richelle Mead. For one of the requirements, I need a symbol. It doesn't have to be a really common symbol, or really obvious, but I just searched like crazy and cannot find one. Does anyone have any ideas? All answers (obviously not rude, irrelevant, or mean ones) are appreciated. :)