A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, postComments } from '@wordpress/icons';
<Icon icon={postComments} />
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" aria-hidden="true" focusable="false"><path d="M14 10.1V4c0-.6-.4-1-1-1H5c-.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 1-1zm-1.5-.5H6.7l-1.2 1.2V4.5h7v5.1zM19 12h-8c-.6 0-1 .4-1 1v6.1c0 .6.4 1 1 1h5.7l1.8 1.8c.1.2.4.3.6.3.1 0 .2 0 .3-.1.4-.1.6-.5.6-.8V13c0-.6-.4-1-1-1zm-.5 7.8l-1.2-1.2h-5.8v-5.1h7v6.3z"></path></svg>
postComments – WordPress Icon Library