This reminds me of Keith Houston's wonderful blog, Shady Characters (http://www.shadycharacters.co.uk/ http://www.shadycharacters.co.uk/). Keith has written at

This reminds me of Keith Houston's wonderful blog, Shady Characters (http://www.shadycharacters.co.uk/ http://www.shadycharacters.co.uk/). Keith has written at length on the pilcrow, interrobang, and sarcasm marks (all touched upon briefly in this article) amongst other punctuation marks. I am somewhat surprised that Shady Characters was not cited by the article. There is simply no better place to learn the surprising, entertaining histories of our punctuation.