Pi function

In mathematics, three different functions are known as the pi or Pi function:

$\pi (x)\,\!$ (pi function) – the prime-counting function
$\Pi (x)\,\!$ (Pi function) – the gamma function when offset to coincide with the factorial
Rectangular function

You might also be looking for:

$\prod _{n=1}^{\infty }$ – the Infinite product of a sequence
Capital pi notation

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