There was a project a while back that attempted to do this, named “Dotsies”.

https://www.omniglot.com/conscripts/dotsies.htm (original site https://www.dotsies.org, which has a casual introduction text that slowly transitions into dots; however, it was unavailable at the time of writing.)

As various Japanese developers have discovered, you can fit quite a lot of distinct characters into 8x8 if your audience is familiar with them: https://japanese.stackexchange.com/questions/36423/is-this-8...

However I don't think even native developers with full Unicode language support tend to use Japanese/Chinese characters in variable names or keywords. There is the occasional hybrid registry key such as "令和_令_Reiwa_R" (which will allow the temporary replacement of the name of the Emperor in Windows dates when the current one dies).

Doesn't braille already cover this need?

This would be insanely cool. Building characters for the digital era not for handwriting.