Haskell can do it: there's a library with common Unicode operators[1] (including ∘ for function composition) and an extension allowing you to use Unicode syntax[2] (things like → in place of ->).

I've seen these things used, but they're not super common. People still worry about not being able to input Unicode symbols in their editor! I personally think this is absurd in this day and age. Naturally, it's very easy to do in Emacs; somebody even wrote a Haskell input mode[3].

[1]: http://hackage.haskell.org/package/base-unicode-symbols-0.2....

[2]: http://www.haskell.org/ghc/docs/7.2.1/html/users_guide/synta...

[3]: https://github.com/roelvandijk/emacs-haskell-unicode-input-m...