\documentclass[12pt]{article}

\usepackage[pipe]{mkessler-code}
\usepackage{mkessler-vocab}

\begin{document}

\begin{table}[htpb]
  \centering
  \begin{tabular}{c| c | c}
    test & bla & \code{test_}
  \end{tabular}
  \caption{caption}
  \label{tab:label}
\end{table}

\code{test__}

\vocab{| this is a test_|}


%| test ___|

\end{document}