How do you type those in modern text editors? You used to be able to ctrl + letter to input control keys on traditional terminals — was it (ord(char) - 0x20),

How do you type those in modern text editors? You used to be able to ctrl + letter to input control keys on traditional terminals — was it (ord(char) - 0x20), but outside Emacs, vi and similar editors, I am sure you can't do that anymore. If you are questioning existence of human-readable/writeable (typeable?) data formats, you might want to check out SGML/XML, JSON, YAML... Are you surprised that being able to type it out holds true for all of these? Esp on standard keyboards? It's more interesting how SGML-derived languages have kept <> symbols so accessible on keyboards regular people use.