clipped from en.wikipedia.org

The interrobang (/ɪn'tɛrəbæŋ/) (‽) is a rarely used, nonstandard English-language punctuation mark intended to combine the functions of the question mark (also called the interrogative point) and the exclamation mark (known in printers' jargon as the bang). The typographical character is a superimposition of those two marks. The same effect is also frequently achieved by placing the exclamation point before or after the question mark; e.g., "How could you do such a thing!?" or "How could you do such a thing?!"