As a Product Owner, displayimg a human-readable rank (1, 2, 3, etc.) on the cards in the backlog would make prioritizing stories easier. This especially applies to larger backlogs.

Use case:

When we're ranking large numbers of new stories with the our customer in a planning meeting, we need to be able to quickly place these stories in the Top 20, Bottom 20, etc. Having a human readable number that reflected the stories position on the backlog would help with this. At present, we have to count these groupings by hand.