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.
Diacritic
A diacritic – also diacritical mark, diacritical point, diacritical sign, or accent – is a glyph added to a letter, or basic glyph. The term derives from the Ancient Greek ("diakritikós", "distinguishing"), from ("diakrī́nō", "to distinguish"). "Diacritic" is primarily an adjective, though sometimes used as a noun, whereas "diacritical" is only ever an adjective. Some diacritical marks, such as the acute ( ´ ) and grave ( ` ), are often called "accents". Diacritical marks may appear above or below a letter, or in some other position such as within the letter or between two letters.