It looks like ¥ is parsed as part of an identifier (it’s as if you typed Float64XInt64, which is just a long name for a variable which does not exist). You can find a list of unicode symbols which are parsed as operators here: https://github.com/JuliaLang/julia/blob/b29d95119d1f1bd485ba015c2bbfc9b08fcc09b9/src/julia-parser.scm#L16-L38