On Thu, 23 Feb 2012, Khaled Hosny wrote:

> Hi all,
>
> While testing some XITS symbols, I was wondering about the spacing of
> the following symbols:
>
> \setupbodyfont[xits]
>
> \starttext
> $$a < b$$ # reference
> $$a ⨼ b$$
> $$a ⨽ b$$
> $$a ⪝ b$$
> $$a ⪞ b$$
> $$a ⪬ b$$
> $$a ⪭ b$$
> \stoptext
>
> Not sure about the first two, but I think the rest should be mathrel

I agree.

> (additionally, does anyone knows a definite Unicode reference for such
> proprieties?)

I usually use the ams symbol list (as implemented by the unicode-math 
package) as reference.

Aditya