1. [noun] An image, symbol, picture, or other representation usually as an object of religious devotion.
2. [noun] A religious painting, often done on wooden panels.
3. [noun] A person or thing that is the best example of a certain profession or some doing.
4. [noun] A small picture which represents something (such as an icon on a computer screen which when clicked performs some function.)
5. [noun] (linguistics) A type of noun whereby the form reflects and is determined by the referent; onomatopoeic words are necessarily all icons. See also symbol and index.
6. [noun] Pictual representations of files, programs and folders on a computer.
7. [noun] (computer science) a graphic symbol (usually a simple picture) that denotes a program or a command or a data file or a concept in a graphical user interface.
8. [noun] A visual representation (of an object or scene or person or abstraction) produced on a surface; 'they showed us the pictures of their wedding'; 'a movie is a series of images projected so rapidly that the eye integrates them'.
9. [noun] A conventional religious painting in oil on a small wooden panel; venerated in the Eastern Church.