You can type them in console and vim with
File separator - C-v C-\
Group separator - C-v C-5
Record separator - C-v C-6
Unit separator - C-v C-7
They are all visible characters in both vim and emacs by default.You can see them on the terminal with `cat -v`
It would be nice if more tools were built to take advantage of these characters, but there are some that do.