Tyler Cowen of the blog Marginal Revolution responded to an interesting question by a reader. It was:

If you could create a punctuation mark, what would its function be and what would it look like?

Cowen responded:

I've always liked the chess marks "!?" and "?!" and wondered why they weren't used in standard English. The former refers to a startling move which is uncertain in merit and the latter refers to a dubious move which creates difficult to handle complications.

How would you respond?

Link | Image by flickr user Horia Varlan, used under Creative Commons license