# Definition of "nabla" [nabla]

- (noun) A Hebrew stringed instrument.

- (noun) The symbol ∇, used to denote the gradient operator.

## Use "nabla" in a sentence

- "I once wrote "nabla" (an Assyrian harp, term was introduced by the very Anglo Saxon Peter Tait) and I got a very antisemitic reaction to the extent that Jews want to turn everything into something Jewish, even math symbols."
- "The standard quantization is that momentum p is replaced with the operator (hbar/i) nabla (nabla is a directional derivative) and E = ihbar &/& t (& = partial)."
- "The real part is the instanton component that is a nabla S nabla I, reflecting the small quantum aspect of the spacetime — eg a WKB type of approximation."