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}