I've been looking at the documentation for
wp_list_comments(). One of the options is 'short_ping' which is documented thus:
( boolean ) Whether you want to use a short ping.
What on earth is a "short ping" and why would I want one?
This option is used to output a pingback comment. It's passed to the
Walker_Comment class, and if it's set to true, it will output something similar to this:
<li> <div class="comment-body"> Pingback: <a href="author-url-here" rel="external nofollow" class="url">Author Name</a> </div>
The author URL is the field that users enter when filling out the comment form. Note that the closing
</li> is missing intentionally.