Halliday & Matthiessen (1999: 606):
Socio-semiotic systems that are parasitic on language, in the sense that they depend on the fact that those who use them are articulate ('linguate') beings. These include the visual arts, music and dance; modes of dressing, cooking, organising living space and other forms of meaning-making behaviour; and also charts, maps, diagrams, figures and the like.
Blogger Comments:
Halliday later used the term 'epiphytic' rather than 'parasitic', and I labelled such systems 'epilinguistic' in my model of body language.