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Symbol/symbolic: a mode in which the signifier does not resemble the signified but which is fundamentally arbitrary or purely conventional - so that the relationship must be learnt:
e.g. language in general (plus specific languages, alphabetical
letters, punctuation marks, words, phrases and sentences), numbers,
morse code, traffic lights, national flags; |

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Icon/iconic: a mode in which the signifier is perceived
as resembling or imitating the signified (recognizably
looking, sounding, feeling, tasting or smelling like it) - being
similar in possessing some of its qualities: e.g. a portrait,
a cartoon, a scale-model, onomatopoeia, metaphors, 'realistic'
sounds in 'programme music', sound effects in radio drama, a dubbed
film soundtrack, imitative gestures; |

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Index/indexical: a mode in which the signifier is not
arbitrary but is directly connected in some way (physically
or causally) to the signified - this link can be observed or inferred:
e.g. 'natural signs' (smoke, thunder, footprints, echoes, non-synthetic
odours and flavours), medical symptoms (pain, a rash, pulse-rate),
measuring instruments (weathercock, thermometer, clock, spirit-level),
'signals' (a knock on a door, a phone ringing), pointers (a pointing
'index' finger, a directional signpost), recordings (a photograph,
a film, video or television shot, an audio-recorded voice), personal
'trademarks' (handwriting, catchphrase) and indexical words ('that',
'this', 'here', 'there'). |