A spaced en-dash is also commonly used in British english for the parenthesis equivalent. So it's not really "anglosphere".
replyWhile there's no central authority, both Oxford and Cambridge University press style guidelines recommend that.
> em-dash with spaces
replymy favourite (and I hope LLMs never converge to use it)
Isn't that what they predominantly use? I don't think I've ever seen an LLM use an em-dash without spaces. I've never seen an en-dash with spaces, but have seen them in ranges.
replyI checked a message from my last chat with Claude
> Noted for this conversation — though worth flagging
and that's an em-dash (unicode 0x2014)