How can i change images from shortcut menu with an icon font

Hi, I want to change the images in shortcut menu with material icon font from google like i did in the tab menu in this image:

BranchBird.png

I have found in the basic Sugar5 theme the code for it:

{foreach from=$SHORTCUT_MENU item=item}             {if $item.URL == "-"}                     {else}           {$item.IMAGE} {$item.LABEL}         {/if}         {/foreach}

But i dont know from where does it pull out that {$item.IMAGE}, can somebody tell me if that is possible ?

The font icons embeds like this: <i class="material-icons">&#xE5D3;</i>, for refferences: Material Icons Guide - Google Design