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Pie chart diagrams
A pie chart (or a circle chart) is a circular statistical graphic, which is divided into slices to illustrate numerical proportion. In a pie chart, the arc length of each slice (and consequently its central angle and area), is proportional to the quantity it represents. While it is named for its resemblance to a pie which has been sliced, there are variations on the way it can be presented. The earliest known pie chart is generally credited to William Playfair's Statistical Breviary of 1801 -Wikipedia
Mermaid can render Pie Chart diagrams.
pie title Pets adopted by volunteers
    "Dogs" : 386
    "Cats" : 85
    "Rats" : 15
pie title Pets adopted by volunteers
    "Dogs" : 386
    "Cats" : 85
    "Rats" : 35
Syntax
Drawing a pie chart is really simple in mermaid.
- Start with 
piekeyword to begin the diagram - Followed by 
titlekeyword and its value in string to give a title to the pie-chart. This is OPTIONAL - Followed by dataSet
labelfor a section in the pie diagram within" "quotes.- Followed by 
:colon as separator - Followed by 
positive numeric value(supported upto two decimal places) 
 
[pie] [title] [titlevalue] (OPTIONAL) "[datakey1]" : [dataValue1] "[datakey2]" : [dataValue2] "[datakey3]" : [dataValue3] . .
Example
pie
    title Key elements in Product X
    "Calcium" : 42.96
    "Potassium" : 50.05
    "Magnesium" : 10.01
    "Iron" :  5
pie
title Key elements in Product X
    "Calcium" : 42.96
    "Potassium" : 50.05
    "Magnesium" : 25.01
    "Iron" :  15