Icons for items within privacy drop-down menu in the story form

Hi,

With reference to the code below in com_easysocial/themes/wireframe/privacy/form.php

<i class="<?php echo $option->icon; ?>"></i>

I understand that the options array is defined against a type (in this case type=story) within the #_social_privacy table

Could you please help me understand what configuration/code/database-entry defines the icon that will be picked up for a particular privacy option? That is, how is $option->icon set?

Thanks,
Shekhar Borker