On Sat, 21 Sep 2013, Marco Patzer wrote:

> On 2013–09–21 Xan wrote:
>
>> \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.

Hans, could you add the following to char-def.lua

  [0x2300]={
   category="so",
   description="DIAMETER SIGN",
   direction="on",
   linebreak="al",
   mathspec={
    { class="ord", name="varnothing" },
    { class="ord", name="diameter" },
   },
   unicodeslot=0x2300,
  },


Aditya