On 2013–09–21 Xan wrote:

> > On 2013–09–21 Xan wrote:
> > 
> > > \diameter produces a diameter symbol. What is the equivalent in ConTeXt?
> > 
> >   ⌀ or \varnothing
> 
> 
> Really varnothing is not the same as diameter (see the reference of LaTeX I posted before)

  \def\diameter{\char"2300}

> How can I define symbol with unicode equivalent?

  \definesymbol [diameter] [⌀]

> \diameter really is U+2300 I think.

Diameter is U+2300, indeed. And that's exactly what I wrote in my
previous mail ⌀ or \varnothing.

Marco