A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, alignJustify } from '@wordpress/icons';
<Icon icon={alignJustify} />
<svg xmlns="https://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M4 12.8h16v-1.5H4v1.5zm0 7h12.4v-1.5H4v1.5zM4 4.3v1.5h16V4.3H4z"></path></svg>
alignJustify – WordPress Icon Library