A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, sidesTop } from '@wordpress/icons';
<Icon icon={sidesTop} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M3.5 17H5V7H3.5v10zM7 20.5h10V19H7v1.5zM19 7v10h1.5V7H19z" style="fill:#1e1e1e;opacity:0.1"></path><path d="M7 5h10V3.5H7V5z" style="fill:#1e1e1e"></path></svg>
sidesTop – WordPress Icon Library