The only style there that is actually used by a person is the Bourne style. There are other styles that people develop for themselves, for example there was some Haskell program posted to a mailing list with a warning about personal style. This defines:

  (.) :: a -> (a -> b) -> b
  x.f = f x

And then the author can write e.g.

  x.length

Instead of

  length x

I think this is really quite a natural operator (and other languages support it, eg in F# it is pronounced |> and closure has something like it with ->)