texinfo: Inserting a Hashsign

Special Characters

Inserting a Backslash

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14.1.5 Inserting '#' with '@hashchar{}'
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Ordinarily, a hash '#' is a normal character in Texinfo that can be
simply typed in your input where you need it.  The result is to typeset
the hash character from the current font.

  This character has many other names, varying by locale, such as
"number sign", "pound", and "octothorp".  It is also sometimes called
"sharp" or "sharp sign" since it vaguely resembles the musical symbol by
that name.  In situations where Texinfo is used, "hash" is the most
common in our experience.

  However, Texinfo uses the hash character as a special character in one
restricted context: to introduce the so-called '#line' directive and
variants (Note: External Macro Processors).

  So, in order to typeset an actual hash character in such a place (for
example, in a program that needs documentation about '#line'), it's
necessary to use '@hashchar{}' or some other construct.  Here's an
example:

     @hashchar{} 10 "example.c"

  Although '@hashchar{}' can be used nearly anywhere, there is no need
for it anywhere except this unusual case.