The rhetorical question mark or percontation point was invented by Henry Denham in the 1580s and was used at the end of a rhetorical question; however, it became obsolete (its use died out) in the 17th century. It was the reverse of an ordinary question mark, so that instead of the main opening pointing back into the sentence, it opened away from it. This character can be represented using the reversed question mark found in Unicode as U+2E2E. The percontation point is analogous to the irony mark, but those are even more rarely seen.