A Nightingale Rose Chart (Coxcomb Chart or Polar Area Diagram) is a combination of the Radar Chart and Stacked Column Chart. It is helpful when working with cyclic data (months, seasons, years, etc.) and with statistical data. Meteorologists use it to illustrate a wind rose.
A Pie Chart (rarely named Emma chart (or a circle chart) is a circular graphic which is divided into slices to illustrate numerical proportion. In a pie chart, the length of an arc of each slice, (as its central angle and area) is proportional to the value it represents. This chart is named for its resemblance to a pie which has been sliced. Pie charts are used for at least two hundred years in the science, business and mass media.