A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, inbox } from '@wordpress/icons';
<Icon icon={inbox} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path fill-rule="evenodd" d="M6 5.5h12a.5.5 0 01.5.5v7H14a2 2 0 11-4 0H5.5V6a.5.5 0 01.5-.5zm-.5 9V18a.5.5 0 00.5.5h12a.5.5 0 00.5-.5v-3.5h-3.337a3.5 3.5 0 01-6.326 0H5.5zM4 13V6a2 2 0 012-2h12a2 2 0 012 2v12a2 2 0 01-2 2H6a2 2 0 01-2-2v-5z" clip-rule="evenodd"></path></svg>
inbox – WordPress Icon Library