Roman Jakobson’s theory of ‘poetic function’ from his essay ‘Linguistics and Poetics’ (1960) in Language in Literature (1987, p71) is often summarised as follows: ‘The poetic function projects the principle of equivalence from the axis of selection into the axis of combination’. The development of Jakobson’s theory of the ‘Poles of Language’ is traced with reference to the Russian Formalists and Ferdinand de Saussure. The semiotic nature of this Formalist structure is explored and its contribution to the development of the axial model of the metonymic and metaphoric poles of language defined diagrammatically. The diagram is an important development of Jakobson’s own theory of the poles of language and is a unique contribution by this resea...