Public navigation icon? An unreleased idea or...

I found this in the public template PAGE_CONTAINER in the macro nav_link:
HTML:

<xf:if is="$nav.icon"><xf:fa icon="{$nav.icon}" /></xf:if>

Why is this here if there is no way to set an icon for the navigation tab in the navigation settings?

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source https://xfworld.net/threads/public-navigation-icon-an-unreleased-idea-or.47753/