1) In a computer's graphical user interface ( GUI ), an icon (pronounced EYE-kahn ) is an image that represents an application, a capability, or some other concept or specific entity with meaning for the user. An icon is usually selectable but can also be a nonselectable image such as a company's logo.
2) On a Web page, an icon is often a graphical image that represents the topic or information category of another Web page. Frequently, the icon is a hypertext link to that page. Typically, icons are gathered in one or two places on a page, either as separate graphic files or as a single image map .
3) Icon is also a lexical programming language, commonly thought to be an evolution of the SNOBOL programming language