XXXXXXXXXXXXXXXXXXXXX
In My Immortal, Xs are letters that Tara inexplicably adds between chapters, in a long series of capitals. She often adds a 666 in the middle of her X's, like this: "XXXXXXXXXXXXXXXXXX666XXXXXXXXXXXXXXXXXXXX".
She also employs them as "goffik" letters, including them in goff names such as band XBlakXTearX and her Fanfiction.net username, XXXbloodyrists666XXX.