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.
Italian grammar
Questions are formed by a rising intonation at the end of the sentence (in written form, a question mark). There is usually no other special marker, although wh-movement does usually occur. In general, intonation and context are important to recognize questions from affirmative statements.