Unique Returning Users is the analytics metric that shows the number of devices on which your app was opened for the second or greater time.
Total and Trend
The total number for the selected time period appears in blue.
The trend is the percentage change of Unique Returning Users from the previous time period. It's positive and green for increases, and negative and red for decreases.
For example, if you had 11 Unique Returning Users in the past month and 8 Unique Returning Users in the previous month, the number of Unique Returning Users increased by 38%.
Graph
The graph shows the number of Returning Users for a specific date in the time period you selected.
Note: The total number of unique returning users is not the sum of returning users on each specific date. Here's why. If your app was opened on the same device on two different days in the time period, the graph would show it separately on each of those days. However, for the total of unique returning users over the whole time period, this device is only counted once. Read more.
Hover over any point on the graph to see its details. For example, you can see that there were 95 Returning Users on Saturday, Mar 21, 2015. 
Breakdown
Your analytics data for Returning Users is broken down by date. The data is further broken down by platform—iOS devices, Android devices or both (All Platforms). You can also filter this data by country.
For example, you can see that there were 2 Returning Users on Wednesday, June 10, 2015.
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