illustration (
http://definr.com/illustration)
n 1: artwork that helps make something clear or attractive
2: showing by example [syn:
exemplification]
3: a single item of information that is representative of a
type; "this patient provides a typical example of the
syndrome"; "there is a good example on page 10" [syn:
example,
instance,
representative]
4: a visual representation (a picture or diagram) that is used
make some subject more pleasing or easier to understand