[Tex/LaTex] Regularized Product Symbol

Question

How so I make a regularized product symbol like in Deninger's papers. It looks like a II, only large like $\prod$ only with a bottom on it too, as in the following paper abstract:

Answer 1

Here is one way to do it:

\documentclass{article}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{mathtools}
\DeclareMathOperator{\MyProd}{\scalebox{1.4}{$\mathrm{I\kern-0.2ex I}$}}

\begin{document}
$\prod  $ \quad\verb|\prod|

$\MyProd$ \quad\verb|\MyProd|
\end{document}