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Julia supports most unicode characters for function and variable names (and operators), so you can write, eg, "∑(x,µ) = x ⊗ µ" and it won't complain.

AFAIK Fortress did not actually support non-ASCII symbols in the code. What the Fortress team did is have a display layer that was fed a list of symbols using ‘\BigSum’ style ASCII and then merely displayed a selected Unicode symbol in the editor.

Ah, thanks. It's been a while since I looked at the Fortress papers.

JavaScript, Java and C# all allow Unicode characters as identifiers.

We do. Look at Scala. Almost no limitations here.