50. Stem and leaf plot

http://mainland.cctt.org/mathsummer/josephbond/stemandplots/stem-and-leaf_std.htm

A stem-and-leaf-plot displays data in an organized shape and distribution by splitting each data value into a "stem" and "leaf". This is strategic way to organize a set of data with many large values, and this technique group the numbers with the same stems. For example, this maps per capita GNP Western Africa. You can see in the key that 4 is the stem, and 80 is the leaf, and together that represents an income of $480. These kind of plots are used to help analysts look over large amount of numbers, by putting the largest digits on the stem and digits in the smallest place as the leaves.