A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, warning } from '@wordpress/icons';
<Icon icon={warning} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="-2 -2 24 24" aria-hidden="true" focusable="false"><path d="M10 2c4.42 0 8 3.58 8 8s-3.58 8-8 8-8-3.58-8-8 3.58-8 8-8zm1.13 9.38l.35-6.46H8.52l.35 6.46h2.26zm-.09 3.36c.24-.23.37-.55.37-.96 0-.42-.12-.74-.36-.97s-.59-.35-1.06-.35-.82.12-1.07.35-.37.55-.37.97c0 .41.13.73.38.96.26.23.61.34 1.06.34s.8-.11 1.05-.34z"></path></svg>
warning – WordPress Icon Library