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If codegolf.stackexchange.com is any proof, it will probably be a couple of characters from one of the higher Unicode planes that don't even have a symbol in most fonts, in one of those languages you've never heard of, that were created mainly to skirt the code golf rules.

Or a builtin Mathematica function for it

That's unusually hard to Google for :)

I did find one example: https://codegolf.stackexchange.com/questions/74767/code-golf...

http://golf.shinh.org/p.rb?FizzBuzz

That's just fizzbuzz.