Sometimes, working in a text editor with my favorite monospaced font Lucida Console, I encounter the fact that I cannot distinguish an unbreakable space from a regular or a long dash from a hyphen-minus. And I got the idea to change the font so that you can see the differences between the characters.
Some applications allow you to show the markup and somehow select special characters, but support for such things is not everywhere. Office packages are not the best place for layout, and the maximum that can be obtained from them is useful - the selection of an inseparable space.
Unfortunately, my searches on this topic on the Internet were not crowned with success. There was no standard notation for a non-breaking space or a dash, so it was decided to modify the font on its own. Of the free font modification software, only
FontForge was found.
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That's what happened in the end.
Lucida Console modified:

Times New Roman:

I can’t upload Lucid for licensing reasons, but there is a free
Free Monospaced from the Ubuntu distribution.