A searchable guide to the complete WordPress Icon Library (@wordpress/icons) package from Gutenberg.
import { Icon, comment } from '@wordpress/icons';
<Icon icon={comment} />
<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false"><path d="M18 4H6c-1.1 0-2 .9-2 2v12.9c0 .6.5 1.1 1.1 1.1.3 0 .5-.1.8-.3L8.5 17H18c1.1 0 2-.9 2-2V6c0-1.1-.9-2-2-2zm.5 11c0 .3-.2.5-.5.5H7.9l-2.4 2.4V6c0-.3.2-.5.5-.5h12c.3 0 .5.2.5.5v9z"></path></svg>
comment – WordPress Icon Library