{-# LANGUAGE UnicodeSyntax #-}... then you are good to go! Of course, you still need a good way to enter Unicode symbols, so you should consult Wikipedia's great article on unicode input.
There is one catch, namely that the first character of all variables cannot be upper-case and that includes Unicode characters like Δ. The only way to get around this is to prefix it with some unintrusive character like _ or 'This also means that you should use lower-case theta, lower-case phi, lower-case psi, and so on.
I've provided some examples to whet your appetite for greek variables:
spherical (x, y, z) = (r, θ, φ) where r = sqrt $ x^2 + y^2 θ = acos $ z / r φ = atan2 y x π = pi α = δω / δtHowever, always keep in mind that Unicode makes it harder for other people to read and edit your source code, so don't go crazy.
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