The interrobang is a combination of a question mark and an exclamation point. Many of us use this punctuation when we type ?!, but a real interrobang is a merger of these two symbols: ‽

Martin K. Speckter is credited with inventing the interrobang in 1962. He was an advertising executive, and needed a better way to express rhetorical questions in his copy. He designed the punctuation, and then solicited suggestions for what to name it. He chose interrobang, which combines the Latin for question (interro-) with a proofreading term for exclamation (bang).

should I not be looking for a way to map this char to my keyboard?! (or more appropriately, ‽)

The installation is hand made over four years of hard work, complete with electrical lights and a moving train, all made of paper!