In class we began to learn about semiotics and were asked to do a short activity to table 'Signifier', 'Signified' and 'Referant' to gain a clearer understanding of what these words meant, and about Semiotics all together.
If the signifier was to be a thumbs down, this would signify that the person was fed up, which is a Referent of a symbol. Or if the signifier was the colour red, this could signify anger, but also be a Referent for stop.