[_Microft]

Use two or more spaces at the beginning of a line and it will be formatted as code ("<code>") and then use symbols as you like.

  ┌──────╖
  │  OK  ║
  ╘══════╝

https://news.ycombinator.com/formatdoc

[BoorishBears]

  ┌──────────╖
  │  CANCEL  ║
  ╘══════════╝

(for posterity)