Fourteen punctuation marks in English grammar: Period, comma, colon, semicolon, dash, hyphen, apostrophe,question mark, exclamation point, quotation mark, brackets, parenthesis, braces, and ellip ses.
You mean the inverted question mark? Yes, is a formality. I was talking to him in a formal manner. However, you don't need to use the inverted question mark when the question is short, at least that is what I have heard.