Wikipedia:Manual of Style Wikipedia
Dialogue Punctuation University Writing & Speaking Center University of Nevada, Reno However, the question mark is very commonly used, especially in casual and creative writing and in manga. It is generally known formally as 疑問符 (gimonfu) or less formally はてなマーク (hatena māku), but the katakana form of “question mark” (クエスチョンマーク or クエッションマーク) is also common. …
