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Percentage!
Ratio of 23 million out of 66 million =23,000,000 : 66,000,000This can be simplified by dividing both sides by 1,000,00023:66This can not be further simplified, so the final ratio is23:66The : symbol is the math symbol to show a ratioSometimes a ratio is expressed as a fraction so another way to represent this is23/66
pi is not an abbreviation. It is a letter of the Greek alphabet symbol that symbolises one particular ratio.
A colon is used between the number of a ratio. (A colon is also used to separate the digits of a sexagesimal (base 60) number used to represent seconds (or minutes) since midnight, ie the time of day.)
pi is represented by the Greek letter (of the same name) π and is the ratio of the circumference of a circle to its diameter.