Semiotics
Semiotics is the study of signing. This sign will represent something other than itself.

An example of an sign which represents something other than its self is open sign. It does not just mean open, it could be a sign symbolising that this building is a business.

The two main approaches to semiotics are Ferdinland desaussure and Charles Sander pierces.

Ferdinland represented the Dyadic semiotic system, sign=signifier ± signified.

Charles represented the Pierces Trydic semiotic system, sign-object-interpretant.

Charles theory which makes up a sign are two objects:
The symbol and the index's

Luke Hignett