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@|: Literal vertical bar, or optional line break

In the TeX (documentation) part of a section, @| inserts a vertical bar. Here's a LaTeX example:

\begin{verbatim}
  The constructions @|x@| and |x| are very different.
\end{verbatim}

You might wish to try this out to see what FWEAVE produces.

In a code part, @| inserts an optional line break in an expression.