web/web_iconify/readme/USAGE.md

To use icons in your Odoo views, use the following syntax:

<iconify-icon icon="prefix:name"></iconify-icon>

Replace prefix:name with the desired icon name. For example, for Material Design Icons, you would use mdi:home. You can find a list of available icons and icon sets on the Iconify website:

https://iconify.design/