A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, postCommentsForm } from '@wordpress/icons';
<Icon icon={postCommentsForm} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M13 8H4v1.5h9V8zM4 4v1.5h16V4H4zm9 8H5c-.6 0-1 .4-1 1v8.3c0 .3.2.7.6.8.1.1.2.1.3.1.2 0 .5-.1.6-.3l1.8-1.8H13c.6 0 1-.4 1-1V13c0-.6-.4-1-1-1zm-.5 6.6H6.7l-1.2 1.2v-6.3h7v5.1z"></path></svg>
postCommentsForm – WordPress Icon Library