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.
Interrobang
"What the...?! Neves, Called Dead in Fall, Denies It" (headline from "San Francisco Examiner", May 9, 1936)
American Martin K. Speckter (1915 – February 14, 1988) conceptualized the interrobang in 1962. As the head of an advertising agency, Speckter believed that advertisements would look better if copywriters conveyed surprised rhetorical questions using a single mark. He proposed the concept of a single punctuation mark in an article in the magazine "TYPEtalks". Speckter solicited possible names for the new character from readers. Contenders included "exclamaquest", "QuizDing", "rhet", and "exclarotive", but he settled on "interrobang". He chose the name to reference the punctuation marks that inspired it: "interrogatio" is Latin for "rhetorical question" or "cross-examination"; "bang" is printers' slang for the exclamation mark. Graphic treatments for the new mark were also submitted in response to the article.