How to use Big Pi or product pi(Π) symbol in LaTeX?

Symbol/UnicodeBig Pi/U+03A0
Type of symbolGreek capital letter
Package (requirement)No
ArgumentNo
Latex command\Pi
Example\Pi → Π

You need to use the \Pi command to print the Big Pi symbol in a latex document. This is the default command of latex.

\documentclass{article}
\begin{document}
   \[ Big\; pi =\Pi  \]
\end{document}

Output :

Using big pi symbol without limits.

Big pi with limits

You need to use \Pi_{subscript}^{superscript} command to write Limits with the Big Pie symbol. But I will not recommend this process when you use limits.

\documentclass{article}
\begin{document}
   \[ \Pi_{i=1}^\infty a_i  \]
   \[ \Pi_{i=1}^5 i^2 \]
\end{document}

Output :

Using big pi symbol with limits.

As you can see in the example above, the symbol does not look very good with limits, so it is best to use the \prod command and use \prod_{subscript}^{superscript} to add limits. This is also a default latex command. Below are some examples.

\documentclass{article}
\begin{document}
   \[ \prod_{i=1}^\infty a_i  \]
   \[ \prod_{i=1}^5 i^2 \]
   \[ \prod_{i=1}^k \frac{n+1-i}{i} \]
\end{document}

Output :

Big pi using prod command with limits.

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