An icon is a religious work of art that used in a wide number of contexts for an image or picture representation. In normal terms the icon is a sign that stands for an object by representing it concretely or by analogy. In modern culture icon is also used in the general sense of symbols. According to the history several religious cultures have been stirred by concrete images in two or three dimensions. If you go back to the history you can find the icons as scared objects of worship or simply applied as ornaments. In Eastern Christianity the icon is usually a flat panel painting representing holy objects such as Jesus, Mary, angles and cross. In these time icons are also carved in stone, painted on wood, printed on paper or metal and done in fresco work. These icons also make a clear distinction between Christian and Pagan art.
Throughout the history, different religious cultures are inspired and supplemented by the concrete images, no matter whether in 2 dimensions or 3. Degree to which the images are been used and permitted, and the functions — no matter whether they are for the instruction and inspiration, treated as the sacred objects of the veneration and worship, or applied as the ornament — depend on tenets of the given religion in given time and time. In the Eastern Christianity as well as other icon-painting the Christian traditions, icon is normally flat panel painting and depicting the holy being and object like Mary, Jesus, saints, cross and angels. Icons can be cast in the metal, carved in the stone, embroidered on the cloth, painted on the wood, done in the mosaic and fresco work, and printed on the paper and metal, and so on.