Earlier this week I learned about another wonderful punctuation mark that seems to have fallen out of use – or I should say never really caught on – Percontation point or the Rhetorical Question mark. It might be used most appropriately in – are you crazy – where clearly the speaker is not expecting a response.
In the late 16th century, English printer Henry Denham was concerned that the unsavvy readers of English may not catch on to the fact that the question did not require a response and proposed the use of a backward question mark to indicate a rhetorical question. It didn’t really catch on and it fell out of use completely by the 17th century.
I can see it being quite useful on Twitter where one often doesn’t know whether a response is required or not. It also has found use in art work and tshirts.