"A stranger to me, of course," said Locker, his whole form twisting itself into an interrogation-point.
Another of our common wild flowers, which I always look at with an interrogation-point in my mind, is the wild ginger.
So to make sure, whenever he wished an interrogation-point he said "question" at the end of almost every sentence.
Why, Mephisto has some pretty good traits; but Alexander Pope is as crooked as an interrogation-point, inside and out.
A period or any other mark, except an interrogation-point, is not often used after a display line in the title-page of a book.
Each star that blinked down at him as he rode in answer to a night-call seemed an interrogation-point asking, How do I exist?