It's legal Julia.

Julia editors or VS Code with the Julia plugin support LaTeX commands and will perform autocompletion and convert it to the unicode character.

For example, if you write \nabla it will offer autocompletion and write ∇.

I think it's a neat feature and makes a lot of sense in scientific computing contexts but I feel I wouldn't like a code-base that abuses it too much. Sprinkled here and there can help make code more readable, succinct and pleasant.