IMO, or a better description would be complex communication. Using
your rationale the lights on a stop light, red, yellow, and green are a
language of sorts.
Yes. It is debatable indeed wether that is a language. When push comes to
shove I think I believe those things to be a very limited language with just
a few words and hardly any gramar. To me, within the larger context of
comunicating ideas (possibly political ones) through the use of non-verbal
sound the concept of comunication and the transfer of information are much
more interesting then wether something is a actual language, should we be
able to find a definition of "language" that everybody finds satisfactory..