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Representation/Hacking/Wittgenstein: sentences are no representations at all. E.g. "The cat is on the mat" is no representation of reality - it can also be used for various other purposes. (LateVsEarly Wittgenstein).
Representation/Hacking: not sentences (never), but theories: E.g. Maxwell’s theory of electromagnetic waves.
So representations are collections and compilations of sentences in a way.
Representation/Physics/Hacking: are fundamentally different from uncomplicated assertions about the place where my typewriter is that can do without the representation aspect.
Einführung in die Philosophie der Naturwissenschaften Stuttgart 1996