The Collaborative International Dictionary of English v.0.48:

Iconography \I`co*nog"ra*phy\, n. [Gr. ? a sketch or
   description; e'ikw`n an image + ? of describe: cf. F.
   iconographie.]
   1. The art or representation by pictures or images; the
      description or study of portraiture or representation, as
      of persons; as, the iconography of the ancients.
      [1913 Webster]

   2. The study of representative art in general.
      [1913 Webster]

   Christian iconography, the study of the representations in
      art of the Deity, the persons of the Trinity, angels,
      saints, virtues, vices, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

iconography
    n 1: the images and symbolic representations that are
         traditionally associated with a person or a subject;
         "religious iconography"; "the propagandistic iconography of
         a despot"

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "iconography":
   alphabet, art, blueprint, charactering, characterization, chart,
   choreography, conventional representation, dance notation,
   delineation, demonstration, depiction, depictment, diagram, drama,
   drawing, exemplification, figuration, hieroglyphic, ideogram,
   illustration, imagery, imaging, letter, limning, logogram,
   logograph, map, musical notation, notation, pictogram,
   picturization, plan, portraiture, portrayal, prefigurement,
   presentment, printing, projection, realization, rendering,
   rendition, representation, schema, score, script, syllabary,
   symbol, tablature, writing