Most languages support multilingual identifiers those days, but I don't see anyone using them. I've wrote a haskell program with greek symbols as variables once

Most languages support multilingual identifiers those days, but I don't see anyone using them. I've wrote a haskell program with greek symbols as variables once, it was fun and neat. There's a language 1C which is fully in russian - identifiers, functions, docs :) It's used widely to script the same-name business platform.