A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, positionCenter } from '@wordpress/icons';
<Icon icon={positionCenter} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M19 5.5H5V4h14v1.5ZM19 20H5v-1.5h14V20ZM7 9h10v6H7V9Z"></path></svg>
positionCenter – WordPress Icon Library