The paper deals with the concept of sign as has been conceived in different scientific fields. A sign is any entity representing another entity, e.g. smoke is a sign of fire, or a stop signal alerting drivers to come to a halt at a crossroad. To the whole set of signs in human and non-human communication belong different subsets depending on their quality. They can thus be encompassed as visual signs, auditory signs, verbal signs, cloth signs, and the like. As far as linguistics is concerned, semiotics is the sciences that studies linguistic signs, which is tantamount to saying that linguistics is part of a more general science of semiotics which in turn is a branch of general psychology.
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