FWIW, this Wikipedia list corresponds TeX's \triangle with U+2206:
https://en.wikipedia.org/wiki/List_of_mathematical_symbols_by_subject
Mario Carneiro <[email protected]> wrote:
> I'm not so sure about that. It looks like the primary meaning of that
> codepoint is "increment operator", used for small discrete changes, which
> usually is an actual Delta (and read as such aloud). Visually, it also
> shows the same typographic weight changes as is common with Delta that are
> absent in the white triangle symbol.
> 
> As for using the triangle symbol for geometry, well let's just say that's a
> conversation for another day.
> 
> 
> On Sun, Apr 26, 2020 at 10:12 PM Thierry Arnoux <[email protected]>
> wrote:
> 
> > You’re right! Actually, the code I used is x2206, which is listed as
> > “Symmetrical Difference”, so I believe it shall be the correct one.
> > https://codepoints.net/U+2206
> >
> > This is a different code from Uppercase Delta (code x394), I wanted to
> > describe the shape - thanks for correcting me!
> >
> > We can still use the x25B3 code (triangle) for geometry! ;-)
> > BR,
> > _
> > Thierry
> >
> >
> > Le 27 avr. 2020 à 11:44, Mario Carneiro <[email protected]> a écrit :
> >
> > 
> > I think there is a unicode symbol for symmetric difference that is a white
> > upward pointing triangle (U+25B3 △), not an upper case Delta (which looks a
> > bit different due to weight changes along the glyph).
> >
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> >

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