e, <em>origin..</em> is a shorthand for <em>origin..HEAD</em> and asks "What
did I do since I forked from the origin branch?"  Similarly, <em>..origin</em>
is a shorthand for <em>HEAD..origin</em> and asks "What did the origin do since
I forked from them?"  Note that <em>..</em> would mean <em>HEAD..HEAD</em> which is an
empty range that is both reachable and unreachable from HEAD.</p>
</div>
</div>
<div class="sect2">
<h3 id="_other_rev_parent_shorthand_notations">Other &lt;rev&gt;^ Parent Shorthand Notati