% This file is embedded in glossaries-user.pdf 
% Example 1 Simple document with no glossary
% Label: "ex:simplenogloss"
% arara: pdflatex
% arara: pdfcrop
\documentclass[12pt]{article}
\pagestyle{empty}
\usepackage[
 sort=none % no sorting or indexing required
 ] {glossaries} 

\newglossaryentry
{cafe}% label
 {% definition:
 name={café},
 description={small restaurant selling refreshments}
} 

\setacronymstyle{long-short} \newacronym
{html}% label
 {HTML}% short form
 {hypertext markup language}% long form
 

\newglossaryentry
{pi}% label
 {% definition:
 name={\ensuremath{\pi}},
 description={Archimedes' Constant}
} 

% This is a trivial example. For a real document I recommend you use siunitx for units
 \newglossaryentry
 {distance}% label
 {% definition:
 name={distance},
 description={the length between two points},
 symbol={m}
 } 
\begin{document}
First use: \gls{cafe}, \gls{html}, \gls{pi}. Next use: \gls{cafe}, \gls{html}, \gls{pi}. 

\Gls{distance} (\glsentrydesc{distance}) is measured in \glssymbol{distance}. 
\end{document}