Question mark
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, its use died out in the 17th century. It was later revived in modern-day society by Matt DiRoberto. 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.
Q source
While the two-source hypothesis remains the most popular explanation for the synoptic gospels' origins, the existence of the "minor agreements" has raised serious concerns. These minor agreements are those points where Matthew and Luke agree against or beyond Mark precisely within their Markan verses (for example, the mocking question at the beating of Jesus, "Who is it that struck you?" [//], found in both Matthew and Luke but not in Mark, although it should be noted that this "minor agreement" falls outside the usually accepted range of Q.) The "minor agreements" call into question the proposition that Matthew and Luke knew Mark but not each other, e.g. Luke might have indeed been following Matthew, or at least a Matthew-like source. Peabody and McNicol argue that until a reasonable explanation is found the two-source hypothesis is not viable.