Which of the following is NOT a kind of ‘sign’ as suggested by Charles sanders pierce?

The correct option is Visual.

Charles Sanders Peirce, a pioneering American philosopher, developed a triadic model of signs that forms the foundation of semiotics (the study of signs and symbols). According to Peirce's theory, signs are classified into three primary categories based on the relationship between the signifier (the sign itself) and the signified (its object):
1. Icon: A sign that represents its object mainly by its similarity or resemblance to it (e.g., a portrait of a person or a map of a territory).
2. Index: A sign that represents its object by virtue of a physical or causal connection to it (e.g., smoke indicating fire, or footprints indicating that someone walked by).
3. Symbol: A sign that represents its object by virtue of a social convention, rule, or habit, where the relationship is arbitrary (e.g., spoken words, numbers, or a red octagon representing a stop sign).

In contrast, Visual refers to the sensory channel (sight) through which a sign is received, rather than the relational classification of the sign itself. An icon, index, or symbol can all be visual in nature. Therefore, "Visual" is NOT one of the kinds of signs proposed in Peirce's semiotic triad.