On 8 Mar 2015, at 23:17 , Idris Samawi Hamid ادريس سماوي حامد  wrote

On Sun, 08 Mar 2015 05:24:51 -0600, Robert Blackstone  
<blackstone.robert@gmail.com> wrote

I would like to use something like a "half-space" or small space in

All the suggestions you have received are good, but ultimately you might  
want to look at the spaces that Unicode provides, for example 202F. Not  
sure sure which Unicode space character best suits your needs, but once  
you have determined that, you can map it to one of the commands suggested  
by others, or even define it to the exact width you want. For example, I  
use imacron (U+012B) so much that it clashes with other characters. So I  
map it to an alternate version that has a thinner macron:

\defineactivecharacter ī {\fontchar{imacron.alt}}

So what you want is a unicode space character that you can enter in your  
editor, then define it in ConTeXt to exactly what you want.

and Hans Hagen <pragma@wxs.nl> wrote

fyi: the list that Wolfgang shows with verbose space names ... these are 
in fact unicode characters.

Thanks to both of you for pointing this out to me. 
Up till now I have never used unicode characters the way Idris proposes and I’m not sure that I already have the skills to make it work.  
For the moment I’m quite happy with the many possibilities that were given by Wolfgang and Hans.

Best regards,
Robert