An icon (from Greek εἰκών, eikon, "image") is an image, picture, or
representation; it is a sign or likeness that stands for an object by
signifying or representing it, or by analogy, as in semiotics
Throughout history religious cults or religious cultures have been inspired
or supplemented by concrete images, whether in two dimensions or three.
The degree to which images are used or permitted, and their functions,
whether they are for instruction or inspiration, whether treated as sacred
objects of veneration or worship or simply applied as ornament, depends
upon the tenets in a given place and time.
