According to Mashable, there are 12 uncommon punctuation marks we should be using right now. While interesting, it's hard to say where we might find them in order to use them. Certainly they aren't part of any keyboard I've ever seen. Here is another site with 13 unusual punctuation marks.
You just can't get them in order to use them as far as I've searched.
Here's a mark for irony or sarcasm