@deborahh @raganwald Not sure if you're serious or not, but just in case…

The OED has a reference to the em dash by that name as early as 1836: https://www.oed.com/dictionary/em-dash_n?tl=true

One expert notes that it's existed "Since the days of metal type" and claims its use declined after the invention of the typewriter: https://literaryashland.org/?p=11371

And Wikipedia has examples of similar varieties of dashes, albeit with different names, by 1733: https://en.wikipedia.org/wiki/Dash#History

This isn't "nonsense", and it's certainly not new.