Box Plot

http://nelsontouchconsulting.wordpress.com/2011/01/07/behold-the-box-plot/

A box plot is a graphical rendition of statistical data based on the minimum, first quartile (or lower quartile), median, third quartile (or higher quartile), and maximum.  The figure above is a box plot in a simplified form.  The name "box plot" is given due to its box shape.