That's pi, the sixteenth letter of the Greek alphabet.
In mathematics, it is defined as the numerical value of the ratio of the circumference of a circle to its diameter.
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It is the Greek letter pi which, in mathematics, represents the ratio of the perimeter of a circle to its diameter.
there is no symbol for it.
If you mean the symbol &, it is called an ampersand.
r is the symbol for rate
pagen religion symbol
It is the symbol for infinity.