Question

What is upside down triangle symbol mean in mathematical notation?

Answer 1

Or in more formal math: (Assuming F_x is the field in the x-direction.) A few remarks: Thesymbol for divergence is theupside down triangle for gradient (called del) with a dot [triangledown.

Answer 2

The symbol for divergence is the upside down triangle for gradient (called del) with a dot [triangledown. ... Divergence is a single number, like density.