This is quite a cool little symbol. Designed to handle that specific exclamation that sees you questioning why the smooth flow of the Universe suddenly turned left.
The symbol predates the Internet and emoticons and should be available on most computers as it is in several fonts and has its own Unicode code-point,
U-203d. If you're unlucky and can't see it then it looks like a question mark superimposed on an exclamation mark so the periods coincide.
Its use seems to have been quite faddish during the 1960s and then faded. Personally I think it's definitely time for a revival.