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In mathematics, at least four different functions are known as the pi or Pi function:

• ${\displaystyle \pi (x)\,\!}$ (pi function) – the prime-counting function
• ${\displaystyle \Pi (x)\,\!}$ (Pi function) – the gamma function when offset to coincide with the factorial
• Rectangular function
• ${\displaystyle \pi (n)\,\!}$ – the Pisano period

You might also be looking for:

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

• Disambiguation pages