Biosemiotics&_160;· Code
Computational semiotics
Connotation&_160;· Decode&_160;· Denotation
Encode&_160;· Lexical&_160;· Modality
Salience&_160;· Sign&_160;· Sign relation
Sign relational complex&_160;· Semiosis
Semiotic elements & sign classes
Semiosphere&_160;· Literary semiotics
Semeiotic&_160;· Umwelt&_160;· ValueJuri Lotman, a semiotician at Tartu University, Estonia, was inspired by Vernadsky's terms biosphere and noosphere to propose that a semiosphere comes into being when any two Umwelten are communicating. Later, Jesper Hoffmeyer suggested a variation to the effect that the community of organisms occupying the semiosphere will inhabit a "semiotic niche". This implies that the semiosphere may be partially independent of the Umwelten. Kalevi Kull argues that this suggestion is not consistent with the nature of semiosis which can only be a product of the behaviour of the organisms in the environment. It is the organisms that create the signs which become the constituent parts of the semiosphere. This is not an adaptation to the existing environment, but the continuous creation of a new environment. Kull believes that it is only possible to accept Hoffmeyer's view as an analogy to the concept of an ecological niche as it is traditionally used in biology, so that the community develops according to the semiotic understanding of the processes which are responsible for the building of Umwelt.
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