Re: General punctuation spaces U+2000 to U+200B

William Overington scripsit:

> What is the difference between U+2000 EN QUAD and U+2002 EN SPACE please?
> 
> What is the difference between U+2001 EM QUAD and U+2003 EM SPACE please?

There is none; they are canonically equivalent.  Only one of each should
have been encoded.  So it goes.

> In letterpress printing, with handsetting of type from a metal font which
> had been cast by a typefounder, I always thought of a quad as something like
> a 2 em quad or a 4 em quad, that is, as a multiple em width block of spacing
> used at each end of a line of handset type to give stability, or used within
> a line to space out a fleuron or some such ornament.  So an em quad seems
> not to fit with that, so what is the meaning please?

Just what you'd expect: a spacer whose width is 1 em.

-- 
"In my last lifetime,                           John Cowan
I believed in reincarnation;                    http://www.ccil.org/~cowan
in this lifetime,                               jcowan@xxxxxxxxxxxxxxxxx
I don't."  --Thiagi                             http://www.reutershealth.com