A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, arrowDown } from '@wordpress/icons';
<Icon icon={arrowDown} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="m16.5 13.5-3.7 3.7V4h-1.5v13.2l-3.8-3.7-1 1 5.5 5.6 5.5-5.6z"></path></svg>
arrowDown – WordPress Icon Library