In Beamer, create a square with a number in it (like enumerate)

Question

I have an enumerate environment with square icons, which gives me a colored square with a number inside for each item.

Below this, I have things I would like to visually correspond with these items. So I am looking to just make this same square with a number inside. Any ideas?

Edit: Here is a minimal working example:

\documentclass[mathserif,xcolor=svgnames]{beamer}
\setbeamertemplate{enumerate items}[square]
\begin{document}

\begin{frame}{Example}
 \begin{enumerate}
  \item Hello there
 \end{enumerate}
\end{frame}

\end{document}

Answer 1

The code for creating the boxes can be found in beamerbaseauxtemplates.sty. You can wrap it in a new command so you can use it outside enumerations:

\documentclass[mathserif,xcolor=svgnames]{beamer}
\setbeamertemplate{enumerate items}[square]
\begin{document}

\newcommand\boxednumber[1]
{%
  \hbox{%
    \usebeamerfont*{item projected}%
    \usebeamercolor[bg]{item projected}%
    \vrule width2.25ex height1.85ex depth.4ex%
    \hskip-2.25ex%
    \hbox to2.25ex{%
      \hfil%
      \color{fg}#1%
      \hfil}%
  }%
}

\begin{frame}{Example}
 \begin{enumerate}
  \item Hello there
 \end{enumerate}

Let's talk about item \boxednumber{1}
\end{frame}

\end{document}

Answer 2

Here's another way to do this but using \label and \ref instead. I created a \squareref command which will enclose its reference in a square box. I did this originally for the ball type references, so I've included that code in the example as well. The basic code is taken from the same beamer source as in Jake's answer.

\documentclass{beamer}

\newcommand*{\squareref}[1]{
  \hbox{%
    \usebeamerfont*{item projected}%
    \usebeamercolor[bg]{item projected}%
    \vrule width2.25ex height1.85ex depth.4ex%
    \hskip-2.25ex%
    \hbox to2.25ex{%
      \hfil%
      \color{fg}\ref{#1}%
      \hfil}%
  }%
}

\newcommand*{\ballref}[1]{%
    \begin{pgfpicture}{-1ex}{-0.65ex}{1ex}{1ex}
    \usebeamercolor[fg]{item projected}
    {\pgftransformscale{1.75}\pgftext{\normalsize\pgfuseshading{bigsphere}}}
    {\pgftransformshift{\pgfpoint{0pt}{0.5pt}}
      \pgftext{\usebeamerfont*{item projected}\ref{#1}}}
  \end{pgfpicture}}%


\begin{document}
\setbeamertemplate{enumerate items}[square]

\begin{frame}

\begin{enumerate}
\item\label{item1} Go to \squareref{item2}
\item\label{item2} Go to \squareref{item1}
\end{enumerate}
\setbeamertemplate{enumerate items}[ball]

\begin{enumerate}
\item\label{item3} Go to \ballref{item4}
\item\label{item4} Go to \ballref{item3}

\end{enumerate}

\end{frame}

\end{document}