texinfo: Not Ending a Sentence

Inserting Space

Ending a Sentence

Multiple Spaces

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14.3.2 Not Ending a Sentence
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Depending on whether a period or exclamation point or question mark is
inside or at the end of a sentence, slightly less or more space is
inserted after a period in a typeset manual.  Since it is not always
possible to determine automatically when a period ends a sentence,
special commands are needed in some circumstances.  Usually, Texinfo can
guess how to handle periods, so you do not need to use the special
commands; you just enter a period as you would if you were using a
typewriter: put two spaces after the period, question mark, or
exclamation mark that ends a sentence.

  Use the '@:' command after a period, question mark, exclamation mark,
or colon that should not be followed by extra space.  For example, use
'@:' after periods that end (lowercase) abbreviations which are not at
the ends of sentences.

  Also, when a parenthetical remark in the middle of a sentence (like
this one!) ends with a period, exclamation point, or question mark, '@:'
should be used after the right parenthesis.  Similarly for right
brackets and right quotes (both single and double).

  For example,

     foo vs.@: bar (or?)@: baz
     foo vs. bar (or?) baz

produces

     foo vs. bar (or?) baz
     foo vs.  bar (or?)  baz

'@:' has no effect on the HTML or Docbook output.

  Do not put braces after '@:' (or any non-alphabetic command).

  A few Texinfo commands force normal interword spacing, so that you
don't have to insert '@:' where you otherwise would.  These are the
code-like highlighting commands, '@var', '@abbr', and '@acronym' (Note:
Useful Highlighting).  For example, in '@code{foo. bar}' the period is
not considered the end of a sentence, and no extra space is inserted.