SIGN = any form that has a meaning

COMMUNICATION SYSTEM = A SET OF SIGNS + RULES FOR USING THEM

FORM

+

MEANING

sound, shape,color, scent, movement, electric pulse, etc.
 

function, usage, purpose, etc.

FERDINAND DE SAUSSURE - Swiss Linguist of early 20th century.  First to write about the dual nature of the sign

SIGNIFIER (FORM)   +    SIGNIFIED (MEANING)

SEMIOTICS -The scientific study of signs

TWO CLASSIFICATIONS OF SIGNS:

1. ACCORDING TO USE

NATURAL INDEX

 OR

NON-INDEX

(can only point directly to its meaning) 
 
(can also be used with DISPLACEMENT)

2. ACCORDING TO FORM

ICON  

 OR

SYMBOL

form physically resembles the meaning (onomatopoeia)
 
  (arbitrary connection)

 

ONLY HUMAN LANGUAGE

IS COMPOSED MAINLY OF SYMBOLS