An icon is a small pictogram used in graphical user interfaces to supplement the presentation of textual information to the user.
The LGAM icon as an example is a green book.
All Wikidot sites have a 16x16 favicon, which displays in the browser tab. Again the LGAM favicon is a green book.
Wikidot also has built-in syntax for displaying a list of social bookmark icons. Just add [[social]] to any page, and you get what you see below.