The icons are incorporated in the TilburgsAnsIcons123 font as ligatures. You can access them by typing the words to which they refer. Below you can try this out (Note: unfortunately, not all webbrowsers support ligatures). Typ lindeboom or Westpoint or kroepoekdak and see what happens. In the brochure you find an overview of all icons, from Ans till Zwijsen.
Some browsers (Chrome) only show the icons if you paste the words in this text field (Ctrl-V) instead of typing.