7. I need to express things like (longhand) 'this fullword contains the elapsed time in units of 1048576 microseconds'. I would imagine something like '. units of µs × 2²°.' (horrid superscript, I know) might be an adequate shorthand, and thought of siunitx: binary-units=true, prefixes-as-symbols=false, ]{siunitx}. \subsection{The unit macros} The package always defines the basic set of \acro{SI} units with macro names. This includes the base \acro{SI} units, the derived units with special names and the prefixes. A small number of powers are also given pre-defined names. Full details of units in the \acro{SI} are available on-line~\cite{BIPM}.

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I often use the \si[]{} command from the siunitx package in math mode to avoid formatting the units using \mathrm{} and superscripts, however when doing this there is no space displayed at all between the numbers and the units, it looks weird. for example: \(\mathrm{m}=1 \si{\kilo\gram}\) I can overcome this in inline math mode doing this:. Thus, the "recommended" way is your option 3: One more quote from section 4.3 of the documentation: The formatting methods will work with both math and text mode. So it doesn't really matter whether you put \si inside or outside of math-mode, as long as you choose the appropriate space.