A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, sidesLeft } from '@wordpress/icons';
<Icon icon={sidesLeft} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M5 17H3.5V7H5v10z" style="fill:#1e1e1e"></path><path d="M7 20.5h10V19H7v1.5zM19 7v10h1.5V7H19zM7 5h10V3.5H7V5z" style="fill:#1e1e1e;opacity:0.1"></path></svg>
sidesLeft – WordPress Icon Library