A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, sidesHorizontal } from '@wordpress/icons';
<Icon icon={sidesHorizontal} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="m7.5 6h9v-1.5h-9zm0 13.5h9v-1.5h-9zm-3-3h1.5v-9h-1.5zm13.5-9v9h1.5v-9z" style="opacity:0.25"></path><path d="m4.5 7.5v9h1.5v-9z"></path><path d="m18 7.5v9h1.5v-9z"></path></svg>
sidesHorizontal – WordPress Icon Library