How to create small SPACES in HTML?

There is em dash and en dash. Is there an "en" equivalent to   ? Is there an en equivalent to pure Ascii 32?

I want a better way to write this:

123<span class="spanen">&nbsp;</span>456<span class="spanen">&nbsp;</span>789

or this:

123<span class="spanen"> </span>456<span class="spanen"> </span>789