I didn't know about the Unicode tab completion. I gave it a whirl on the cli and loved it. Then I tried it out in julia-mode in Emacs, and it works there too! What other editors support this?
vim: https://github.com/JuliaEditorSupport/julia-vim
I have an F-key shortcut in my .vimrc to turn this on mainly for non-Julia files, so that I can type (maths-y) unicode in Markdown / text files.
Certainly Atom (and Juno), Sublime Text, and Jupyter notebooks.