Question mark
In the early 13th century, when the growth of communities of scholars (universities) in Paris and other major cities led to an expansion and streamlining of the book-production trade, punctuation was rationalized by assigning Alcuin's stroke-over-dot specifically to interrogatives; by this time the stroke was more sharply curved and can easily be recognized as the modern question mark.
Gregory Edwards
"The question mark might serve as an entry point to the 32-year-old artist's ongoing interest in the push and pull between abstraction and representation, the open-ended sense of play in his wild, often ostentatious patterning and his rigid structural control, and flat, thinly applied surfaces. After all, a question mark added to any last word turns the work of interpretation onto the audience."