the Julia REPL allows you to type unicode with \blah, also if you use `?` help mode, you can give it a unicode sequence and it will tell you how to type it, so

the Julia REPL allows you to type unicode with \blah, also if you use `?` help mode, you can give it a unicode sequence and it will tell you how to type it, so it's nice quality of life help?> Ψ₂ˣ "Ψ₂ˣ" can be typed by \Psi<tab>\_2<tab>\^x<tab>