An Etymological Dictionary of Astronomy and Astrophysics

1. An image; a representation.
   

   2. A representation or picture of a sacred or sanctified Christian personage, traditionally used and venerated in the Eastern Church.
      

   3. A person or thing regarded as a symbol of a belief, nation, community, or cultural movement.
      

   4. Computers: A pictorial representation of a facility available on a computer system, that enables the facility to be activated by means of a screen cursor rather than by a textual instruction (TheFreeDictionary.com).

Etymology (EN): From Gk. eikon “likeness, image, portrait; a semblance;” in philosophy, “an image in the mind,” related to eikenai “be like, look like,” from PIE *weik- “to be like.”

Etymology (PE): Zodiš, variant of Mid.Pers. uzdês “icon; image; idol,” from uz-, → ex-, + dês, Av. daēs- “to show;” cognate with Gk. deiknumai “to show;” L. dicere “to utter, say, proclaim;” N.H.G. zeigen “to say;” O.E. têon “to annoince;” PIE
*deik- “to show, point out; announce.”