A Crosstion mark is an Agnostic symbol that is used as a tattoo or just something that let's everyone know they don't agree with everyone elses oppinion on Religion. It looks lke an upper case T with the hook shaped part of a question mark attached in the middle of the top part of the T with the dot of a question mark found directly underneath it. It usually has the words "Question Everything" written somewhere around it.
Reid "hell is that thing? is it some kind of Nazi symbol?"
Daniel "hell no, it's a crosstion mark dumbass"
Reid "....oh...wanna go smoke?"