It is the result of drawing stem-and-leaf plots for two variables, back-to-back, such that they share the same stem.
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I think its a stem and leaf plot
Yes, it does exist. And the question is ...
it shows groups of data arranged by place value.
A double stem plot is a graphical method for displaying the values from two samples whose values extend over similar ranges. Assuming that you know what a (single) stem plot is, begin making a double one by using the smallest element from the two samples to form the first item for the stem, and place it at the top of the stem. Now complete the a stem plot for the first sample in the usual way on the right side of the stem. Having done that, create the leaves for the other sample elements on the left side of the stem. The link points to a page with an example.
The let side of a stem a stem and leaf plot