noun (n)

• artwork that helps make something clear or attractive(noun.communication)

  source: wordnet30
• showing by example(noun.communication)

  Synonym:
  exemplification
  

  source: wordnet30
• an item of information that is typical of a class or group(noun.cognition)

  Synonym:
  example, instance, representative
  

  source: wordnet30
• a visual representation (a picture or diagram) that is used make some subject more pleasing or easier to understand(noun.artifact)

  source: wordnet30
• The act of illustrating; the act of making clear and distinct; education; also, the state of being illustrated, or of being made clear and distinct.(noun)

  source: webster1913