> Both already possible, they have official symbols representing them. I'm not sure what you mean. For an illustration, my terminal does not print anything for

> Both already possible, they have official symbols representing them. I'm not sure what you mean. For an illustration, my terminal does not print anything for them. $ printf "qq\36\37text\n" qqtext *Update/Aside:* "My terminal", in this case, was `tmux`. Ghostty, OTOH, prints spaces instead of RS or US. Unicode does have some symbols for every non-printable ASCII character, which you can see as follows with https://github.com/sharkdp/bat https://github.com/sharkdp/bat (assuming your font has the right characters, which it probably does): $ printf "qq\36\37text\n" | bat -A --decorations never qq␞␟text␊ Here, `␞` is https://www.compart.com/en/unicode/U+241E https://www.compart.com/en/unicode/U+241E, one of the symbols for non-printable characters that Unicode has; different fonts display it differently. See also https://www.compart.com/en/unicode/block/U+2400 https://www.compart.com/en/unicode/block/U+2400. Is there some better representation it has?