Yeah, I just tried it with the inverted question mark (¿) and interrobang (‽) -- both attempts had the correct glyph for the first result.
Maybe we're training it?
Maybe we're training it?
It could be gathering data about how people draw shapes in general, but it's not immediately obvious to me how much that can help.
Actually there is a "Good" and "Bad" voting feature for each result.
EDIT: Tried one more time and got it as the 9th suggestion.