A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, symbolFilled } from '@wordpress/icons';
<Icon icon={symbolFilled} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M21.3 10.8l-5.6-5.6c-.7-.7-1.8-.7-2.5 0l-5.6 5.6c-.7.7-.7 1.8 0 2.5l5.6 5.6c.3.3.8.5 1.2.5s.9-.2 1.2-.5l5.6-5.6c.8-.7.8-1.9.1-2.5zm-17.6 1L10 5.5l-1-1-6.3 6.3c-.7.7-.7 1.8 0 2.5L9 19.5l1.1-1.1-6.3-6.3c-.2 0-.2-.2-.1-.3z"></path></svg>
symbolFilled – WordPress Icon Library