Semiotics

Semiotics, also known as semiotic studies or semiology or signification and communication, signs and symbols, and is usually divided into three branches:
Semantics: Relation between signs and the things to which they refer; their denotata
Syntactics: Relations among signs in formal structures
Pragmatics: Relation between signs and their effects on those (people) who use them.

Semiotics are known as 'the study of signs'.

this was the only picture i could find to demonstrate semiotics :