=item C<< <change>^ >>, e.g., C<HEAD^^>, C<users_table^3>, C<@beta^2>

A suffix C<^> to a symbolic or actual name means the change I<prior> to that
change. Multiple C<^>s indicate multiple prior changes. These can also be
written as C<< ^<n> >>, where C<< <n> >> represents the number of changes to
go back.

=item C<< <change>~ >>, e.g., C<ROOT~>, C<foo~~>, C<@bar~4>

A suffix C<~> to a symbolic or actual name that means the change I<after> that
change. Multiple C<~>s indicate multiple prior changes. These can also be
written as C<< ~<n> >>, where C<< <n> >> represents the number of changes to
go forward.