Why is the question mark the shape it is?
It could be derived from a Latin word meaning "question".
In Latin, quaestio means "question". An idea of how the question mark got the shape it has now is that the "q" and "o" make up the question mark. The "q" has detached and unfurled a little, making the top part, while the "o" shrunk into a dot. The picture below illustrates my point.