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\documentclass{report}
\usepackage[colorlinks]{hyperref}
\usepackage[style=alttreehypergroup]{glossaries}
% The alttree type of glossary styles need to know the
% widest entry name for each level
\glssetwidest{Roman letters} % level 0 widest name
\glssetwidest[1]{Sigma} % level 1 widest name
\makeglossaries
\newglossaryentry{greekletter}{name={Greek letters},
text={Greek letter},
description={\nopostdesc}}
\newglossaryentry{sigma}{name={Sigma},
text={\ensuremath{\Sigma}},
first={\ensuremath{\Sigma} (uppercase sigma)},
symbol={\ensuremath{\Sigma}},
description={Used to indicate summation},
parent=greekletter}
\newglossaryentry{pi}{name={pi},
text={\ensuremath{\pi}},
first={\ensuremath{\pi} (lowercase pi)},
symbol={\ensuremath{\pi}},
description={Transcendental number},
parent=greekletter}
\newglossaryentry{romanletter}{name={Roman letters},
text={Roman letter},
description={\nopostdesc}}
\newglossaryentry{e}{name={e},
description={Unique real number such that the derivative of
the function $e^x$ is the function itself},
parent=romanletter}
\newglossaryentry{C}{name={C},
description={Euler's constant},
parent=romanletter}
\begin{document}
This is a sample document illustrating hierarchical glossary
entries.
\chapter{Greek Letters Used in Mathematics}
Some information about \glspl{greekletter}.
The letter \gls{pi} is used to represent the ratio of a circle's
circumference to its diameter.
The letter \gls{sigma} is used to represent summation.
\chapter{Roman Letters Used in Mathematics}
Some information about \glspl{romanletter}.
The letter \gls{e} is the unique real number such that
the derivative of the function $e^x$ is the function itself.
The letter \gls{C} represents Euler's constant.
\printglossaries
\end{document}
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