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@abbr{abbreviation[, meaning]}
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 (see Not 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 abbreivation 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 and XML, 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.