Box plot

Box plots are used to display a 5 number data summary. The upper limits of the box contain the 75th percentile while the lower limits of the box contain the 25th percentile. The middle of the box contains the 50th percentile. With in the box plot is the median, the upper and lower quartiles and the minimum and maximum data values. The line in the middle of the box shows the median values while the outer lines show the minimum and maximum values.

Link: http://dominiquegrant.blogspot.com/2009/01/box-plot.html