Nov 27, 2021
The percontation point, a reversed question mark and later referred to as a rhetorical question mark, was proposed by Henry Denham in the 1580s and was used at the end of a question that does not require an answer. Its use died out in the 17th century. – WTF Fun Facts
Source: Ironic Serif: A Brief History of Typographic Snark and the Failed Crusade for an Irony Mark – The Marginalian