verbatim
\begin{verbatim} literal-text \end{verbatim}
The verbatim
environment is a paragraph-making environment in
which LaTeX produces exactly what you type in; for instance the
\
character produces a printed ‘\’. It turns LaTeX
into a typewriter with carriage returns and blanks having the same
effect that they would on a typewriter.
The verbatim
uses a monospaced typewriter-like font (\tt
).