Icons are a special form of buttons. They are used a lot on mobile devices and can create beautiful pages. You drag icons from the toolbox to the page you build, decide how many you want and then start updating them to your preference.
The builder has many Icon pictures to choose from but you can also upload any other Icon you have.
The property page also asks you to specify which page will be activated when you click on the Icon, in the same way this is done with menu options, cards and buttons.