You probably already know the interrobang, thanks to its popularity (You did what!?). Though the combination exclamation point and question mark can be replaced by using one of each, they can also be combined into a single glyph. The interrobang was invented by advertising executive Martin Speckter in 1962, who said “it is the typographical equivalent of a grimace or a shrug of the shoulders. It applied solely to the rhetorical, when a writer wished to convey incredulity.” The name is derived from the Latin word interrogatio, which means “questioning,” and bang—how printers refer to the exclamation mark.
“symbols are nothing but the natural speech of drama”
source: mental flosss