A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, arrowDownLeft } from '@wordpress/icons';
<Icon icon={arrowDownLeft} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M14 18H6V10H7.5V15.5L17 6L18 7L8.5 16.5H14V18Z"></path></svg>
arrowDownLeft – WordPress Icon Library