There are 280+ feather icons and you can get all icons info from here: https://feathericons.com/
<i data-feather="mail" class="fea icon-sm"> </i>
There are 4400+ Material Design icons and you can get all icons info from here: https://materialdesignicons.com/
<i class="mdi mdi-home"> </i>
There are Flaticon icons and you can get all icons info from here: https://www.flaticon.com/packs/basic-icon
There are 1100+ Iconscout (Unicons) Icons and you can get all icons info from here: https://www.flaticon.com/packs/basic-icon
<span class="h3 text-primary me-2">
<i class="uil uil-0-plus"></i>
</span>