The theory and study of signs and symbols, especially as elements of language or other systems of communication, and comprising semantics, syntactics, and pragmatics.
semiotician se‘mi·o·ti‘cian http://www.answers.com/topic/semiotics
Semiotics is a wide spectrum of many things to do with communication, type, imagery and what holds them all together. Whether it be a Sign post on the street to a comic strip in a magazine, semiotics is the word for it all.
This image painted by Magritte around 1928, is almost an ironic semiotic. This is because it is communicating a pipe but then saying (with the text) that it is not a pipe. I chose this painting to show this because it is a controversially challenging semiotic. Does it agree with the rules ? or does it break them ?.
Here is another image explaining a different type of semiotics…
these signs are clearly stating instructions, in which you have to follow (communication). Signs are usally in no more than two colours and the colours are usally bold and bright to make people aware of the information the signs are tyring to give e.g Danger in shocking red.