Media language refers to the conventions, formats, symbols and narrative structures that cue audience understanding of meaning in media texts, similar to how grammar structures print media. There are several theories about how meaning is constructed in media. Ferdinand de Saussure's theory suggests that signs have both a signifier (visual form) and signified (concept), and meaning requires both. Stuart Hall's encoding/decoding theory proposes that media producers encode dominant ideologies but audiences decode and interpret meanings. Roland Barthes' theory of denotation and connotation is that the audience draws on social and historical knowledge to interpret the connotations of objects beyond their literal denotations.