latex interpreter greek symbols

I looking to get the gradient magnitude symbol as shown in the below image in my color bar title. I am using latex interpreter, May I know how to get this symbol.

Answer 1

[Walter Roberson]

https://www.mathworks.com/help/matlab/creating_plots/greek-letters-and-special-characters-in-graph-text.html

Use \nabla

[MechenG]

Thanks!, how to get mod symbol?