GNU Info

(texinfo)dmn

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`@dmn'{DIMENSION}: Format a Dimension
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  At times, you may want to write `12pt' or `8.5in' with little or no
space between the number and the abbreviation for the dimension.  You
can use the `@dmn' command to do this.  On seeing the command, TeX
inserts just enough space for proper typesetting; the Info formatting
commands insert no space at all, since the Info file does not require
it.

  To use the `@dmn' command, write the number and then follow it
immediately, with no intervening space, by `@dmn', and then by the
dimension within braces.  For example,

     A4 paper is 8.27@dmn{in} wide.

produces

     A4 paper is 8.27in wide.

  Not everyone uses this style.  Some people prefer `8.27 in.@:' or
`8.27 inches' to `8.27@dmn{in}' in the Texinfo file.  In these cases,
however, the formatters may insert a line break between the number and
the dimension, so use `@w' (Note: w).  Also, if you write a period
after an abbreviation within a sentence, you should write `@:' after
the period to prevent TeX from inserting extra whitespace, as shown
here.  Note: Not Ending a Sentence.