The mathematical constant Pi, denoted by the Greek letter "π", represents the ratio of a circle's circumference to its diameter. It is an irrational number that begins 3.14159265358979323846... and goes on infinitely without repeating.

While the Greek letter "π" is the standard notation for Pi, it can also be represented in other ways in mathematical expressions and equations. For example, Pi can be written as a symbol "Pi" or a decimal approximation such as 3.14. This decimal approximation can be used in computations and calculations, with the level of precision depending on the specific needs of the problem at hand. In some cases, Pi may also be expressed in scientific notation or as a fraction.

It's worth noting that Pi has been the subject of much study and fascination over the centuries, and has numerous applications in fields such as mathematics, engineering, physics, and computer science. Despite its widespread use and familiarity, Pi continues to be a source of ongoing research and discovery.
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