texinfo: @abbr

Indicating

@acronym

@dfn

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9.1.13 '@abbr'{ABBREVIATION[, MEANING]}
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You can use the '@abbr' command for general abbreviations.  The
abbreviation is given as the single argument in braces, as in
'@abbr{Comput.}'.  As a matter of style, or for particular
abbreviations, you may prefer to omit periods, as in '@abbr{Mr}
Stallman'.

  '@abbr' accepts an optional second argument, intended to be used for
the meaning of the abbreviation.

  If the abbreviation ends with a lowercase letter and a period, and is
not at the end of a sentence, and has no second argument, remember to
use the '@.' command (Note: Ending a Sentence) to get the correct
spacing.  However, you do not have to use '@.' within the abbreviation
itself; Texinfo automatically assumes periods within the abbreviation do
not end a sentence.

  In TeX and in the Info output, the first argument is printed as-is; if
the second argument is present, it is printed in parentheses after the
abbreviation.  In HTML the '<abbr>' tag is used; in Docbook, the
'<abbrev>' tag is used.  For instance:

     @abbr{Comput. J., Computer Journal}

produces:

     Comput. J. (Computer Journal)

  For abbreviations consisting of all capital letters, you may prefer to
use the '@acronym' command instead.  See the next section for more on
the usage of these two commands.