A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, plusCircleFilled } from '@wordpress/icons';
<Icon icon={plusCircleFilled} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M12 4c-4.4 0-8 3.6-8 8s3.6 8 8 8 8-3.6 8-8-3.6-8-8-8Zm3.8 8.8h-3v3h-1.5v-3h-3v-1.5h3v-3h1.5v3h3v1.5Z"></path></svg>
plusCircleFilled – WordPress Icon Library