Inverted Interrobang

It opens a sentence that asks and exclaims at once. The interrobang ‽ is a single mark fusing ? and !, devised in 1962 by the American advertising executive Martin K. Speckter for lines like “You did what‽” Spanish, Galician and Asturian also mark the start of questions with ¿ and of exclamations with ¡. So a fused closing mark logically wants a fused opener, and ⸘ is that opener: ⸘…‽ frames the whole sentence.

Standard Spanish never needed it. The Royal Spanish Academy's spelling rules handle a startled question by combining the ordinary pairs, ¡¿Qué has hecho?! or ¿¡Qué has hecho!?, and that is what Spanish speakers actually write. ⸘ lives in Unicode, in some fonts and in punctuation enthusiasts' writing, as a neat idea rather than a rule.

What does it mean when someone sends ⸘?

A surprised or disbelieving question, from someone who likes rare punctuation. Read it exactly like “?!”: the words around it tell you whether they are amused, shocked or annoyed. Using ⸘ at all is a small typographic flourish, often a wink. If you see a box instead, the sender's mark is fine; your font simply lacks it.