This is one of those things that once you see it it’s amazing that we have gotten along without it.
According to Wikipedia, The interrobang (/ɪn’tɛrəbæŋ/) (‽) is a punctuation mark intended to combine the functions of a question mark and an exclamation point. In informal writing, the same effect is achieved by placing the exclamation point after or before the question mark, e.g. “How could you do such a thing?!”.
I just thought you guys and gals should know. Now your life will feel fuller. Trust me.