This is just a placeholder task to split up the Done column of the Analytics-Kanban task board. The tasks below this task have already been discussed and are ready to be closed.
Hello. Why don't you create another column then actually?
You should be aware of that it is highly unreliable way of sorting and absolutely without any guarantee that that sorting will remain the same.
In any case the task should be in Lowest priority and Stalled status to indicate that it is totally unimportant (in fact void) task.
We would make another column but we have a lot of columns already on boards like this: https://phabricator.wikimedia.org/tag/analytics/. We work our boards pretty aggressively and this hacky separator thing works for us. I'll go through and triage all of the other separators to Lowest / Stalled (unless the default filter hides the stalled tasks).
As for the order not being guaranteed and permanent, that's ok. We wouldn't cry if these tasks disappeared or anything. We mainly use them when we triage lots of tasks so we can know where we're at. And that's mainly in the same hangout session, so it's unlikely to break during our triage.
Thanks for checking though, and sorry this was on your radar inadvertently.