Per mille symbol in SIunitx

Question

There was a previous question on the per mille symbol in latex. I was wondering if it is available in the SIunitx package.

Answer 1

I think this is the most recent siunitx' manual. Here the word percent appears only five times, and I cannot find permille or similar. A possible answer can be found here, that is, you can put the following declaration in the preamble

\DeclareSIUnit\permille{\text{\textperthousand}}

and then use it just as the \percent macro of siunitx.

\documentclass{article}

\usepackage{textcomp} % to use \textperthousand                                                     
\usepackage{siunitx}  
\DeclareSIUnit\permille{\text{\textperthousand}}

\begin{document}      
In normal text        
\SI{10}{\permille}    
is the same as        
\SI{1}{\percent}.     

Also in               
\textit{italic        
\SI{10}{\permille}    
is the same as        
\SI{1}{\percent}      
}                     
\end{document}