Box Plot

http://www.physics.csbsju.edu/stats/box2.html

A box plot, sometimes referred to as box and whisker plot, is used to show five different number summaries at one time; the smallest observation or minimum,lower quartile, the median, upper quartile, and largest observation the maximum. A boxplot may also indicate if a data set has outliers or extremities. In this particular box plot, it is demonstrating in the simplest box plot the central rectangle spans the first quartile to the third quartile (the interquartile range or IQR). A segment inside the rectangle shows the median and "whiskers" above and below the box show the locations of the minimum and maximum.