Semiotics is defined as the science that studies signs.
These signs are divided into three categories: iconic, indexical and symbols. The icons are signs that have resemblance to the object you want to represent (eg photo of the Eiffel Tower, a map). There is no complete analogy with reality, it should take for granted that there are some similarities and some not. These signs are the result of an agreement, because we tend to focus on the relationship between the lines, excluding the size (the tower of Pisa and the Leaning Tower of Pisa souvenir).
I indexical signs have relation of physical continuity with what they want to represent (eg footprint left on the sand; flag in the wind that moves in the direction of the wind, pronouns). The size of conventional
is necessary: \u200b\u200bto belong to a given culture is essential to understand this type of sign.
I have no symbols relationship with what they want to represent (eg all traffic signals, signs in mathematics.) There is therefore no kind of analogy, because elements are entirely conventional.
It must understand the meanings that a particular culture attaches to a signal for a process semiottico.
summary, in short ...
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