The Zeppelin Header - Block Item template displays a link as an icon. The template is a built-in template and comes with your Communifire site.
Note: The bell icon is a Section Widget with the "Open content in modal" setting checked. When this setting is checked, the section widget acts as a button and uses button templates.
Below is the HTML of this template, for your reference.
<li class="{{CustomCSSClass}}"> {{{Contents.CountHTML}}} {{#if Contents.ForegroundImageURL}} <a class="isavatar" href="{{{Contents.URL}}}" {{{Contents.ngCode}}} title="{{WidgetTitle}}" data-toggle="modal" data-backdrop="true"> <img class="x-avatar" src="{{Contents.ForegroundImageURL}}" alt="{{WidgetTitle}}"> </a> {{else}} <a href="{{{Contents.URL}}}" {{{Contents.ngCode}}} title="{{WidgetTitle}}" data-toggle="modal" data-backdrop="true"> {{#if IconCSSClass}}<span class="x-icon"><i class="{{IconCSSClass}}"></i></span>{{/if}} {{#if ShowWidgetHeader}}<span class="x-label"><span>{{{WidgetTitle}}}</span></span>{{/if}} </a> {{/if}} </li>
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