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>#Cybernetics stands to the real machine - electronic, mechanical, neural, or economic - much as geometry stands to a real object
in our terrestrial space.
>It takes as its subject matter the domain of *all possible machines*,
and is only secondarily interested if informed that some of them have not yet been made, either by Man or by Nature.
#WR_Ashby (1956) - *An Introduction to Cybernetics*
>A #sign is something, A, which brings something, B, its #interpretant sign determined or created by it, into the same sort of correspondence with something, C, its #object, as that in which itself stands to C.
#CS_Peirce (1902)
In #Kihbernetics a sign is the #model describing (documenting) a #system ("mental model") abstracted from a real #phenomenon (object) by an #observer (the interpretant).