\documentclass{article}
\usepackage{glossaries}

\makeglossaries

\renewcommand*{\glsentryfmt}{%
  \glsgenentryfmt
  \ifglsused{\glslabel}{}{\space (\glsentrysymbol{\glslabel})}%
}

\newglossaryentry{distance}{name=distance,
description={The length between two points},
symbol={km}}

\newacronym{apa}{apa}{Apa per Apa}

\begin{document}

First use: \gls{distance}. Next use: \gls{distance}.


\end{document}
