Meaning

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

noun a visual representation (of an object or scene or person or abstraction) produced on a surface

noun a conventional religious painting in oil on a small wooden panel; venerated in the Eastern Church

originFrom Latin īcōn, from Ancient Greek εἰκών (eikṓn, “likeness, image, portrait”). Eastern Orthodox Church sense is attested from 1833. Computing sense first recorded in 1982.

Etymology from Wiktionary, CC BY-SA 3.0