lrbox ¶Synopsis:
\begin{lrbox}{box-cmd} 
  text
\end{lrbox}
This is the environment form of the \sbox and \savebox
commands, and is equivalent to them.  See \sbox & \savebox, for the
full description.
The text inside the environment is saved in the box register
referred to by variable box-cmd.  The variable name
box-cmd must begin with a backslash, \. You must allocate
this box register in advance with \newsavebox
(see \newsavebox).  In this example the environment is convenient
for entering the tabular.
\newsavebox{\jhreg}
\begin{lrbox}{\jhreg}
  \begin{tabular}{c}
    \includegraphics[height=1in]{jh.png} \\
    Jim Hef{}feron
  \end{tabular}
\end{lrbox}    
  ...
\usebox{\jhreg}