If you could add a new punctuation mark, what would it be? For example, how about a combination of the ; & the question mark?

For when (such as right now), one asks a question; then wishes to elaborate upon said question further? Or combine ; & ! for similar reasons? Maybe make some sort of shorthand (&, #, @) for the words or , the ?
Update: To make? on a keyboard? I suppose a COMBINATION of other keys,, ; and ? and Alt
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