Why Nabla Symbol Not Listed Under Math Symbols

Dave's Haarp
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Under the list of math symbols, nabla doesn't show up (the upside down triangle).
Why is that?

I just use &#9660 instead.
 
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So I know that electrons are fundamental, there's no 'material' that makes them up, it's like talking about a colour itself rather than a car or a flower. Now protons and neutrons and quarks and whatever other stuff is there fundamentally, I want someone to kind of teach me these, I have a lot of questions that books might not give the answer in the way I understand. Thanks
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