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I have been looking at the Comprehensive list of Latex symbols, but can not seem to find an upside-down letter $\pi$. Is there a package that I need to add so that a command like $\copi$ or $\invpi$ or should one create such a symbol manually?

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You can create upside-down versions of \pi with the help of the \rotatebox and \reflectbox macros of the graphicx package. Two possibilities are shown in the following screenshot.

enter image description here

\documentclass{article}
\usepackage{graphicx} % provides "\rotatebox" and "\reflectbox" macros
\newcommand\rotpi{\rotatebox[origin=c]{180}{$\pi$}}
\newcommand\copi{\reflectbox{\rotpi}}
\begin{document} 
$\pi \rotpi \pi \copi $
\end{document}
  • Thank you. Sorry, this is not part of the original question, but perhaps you might know if there is a way to obtain the mirror image of the upside down $\pi$? I'm just wondering if it might look more aesthetically pleasing. – sqtrat Apr 7 '16 at 16:28
  • @sqtrat \newcommand\rotreflpi{\rotatebox[origin=c]{180}{\reflectbox{$\pi$}}} – egreg Apr 7 '16 at 16:32
  • @egreg Thank you, I'm not very familiar with all these graphic packages like TikZ, graphicx and so forth. Perhaps I should start looking at them... – sqtrat Apr 7 '16 at 16:35
  • @sqtrat - I've updated my answer to show a second possibility, viz., \reflectbox{\rotatebox[origin=c]{180}{$\pi$}}. – Mico Apr 7 '16 at 16:45
  • @sqtrat It is just mirroring after rotating rather than rotating after mirroring. Only the order of operations is different, as far as I can tell. – cfr Apr 7 '16 at 22:32

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