Example image of eyePlorer eyePlorer map for 'Sign (linguistics)': Sign (semiotics) Ferdinand de Saussure Langue and parole Phoneme Michel Foucault Freedom (philosophy) United States Course in General Linguistics Absent referent Blasphemy Glossematics Head-driven phrase structure grammar Unity of the proposition William Dwight Whitney Intrapersonal communication Columbia School of Linguistics Sign Writing system Equivocation Linguistics Sign (disambiguation) Signifier Structuralism Reference