\documentclass[%
	fontsize=10pt,
]{scrartcl}
\usepackage[sanitize=none]{glossaries}
\makeglossaries


\newglossaryentry{sym:eta}{%
	name={\protect\ensuremath{\eta}},
	description={\nopostdesc},
	sort=eta
	}

\newglossaryentry{sym:eta1}{%
	description={Text 1},
	sort={1},
	parent={sym:eta}
	}

\listfiles

\begin{document}

1: \gls{sym:eta1}

\printglossary[style=long]

\end{document}
