[rdlw]

Interesting, I only knew it as the del until now

[weinzierl]

OMG, how did you remember that

  nabla x nabla = labla(ce)?

[henearkr]

I think you meant Laplace (Laplacian operator).

[okanat]

And I thought only ∂ is called "del".

[thatfunkymunki]

i thought it was the symbol for gradient?

edit: ah, the name of the symbol for the gradient operator is nabla