/ˈnæblə/ or /næblə/ (UK) /ˈnæblə/ (US)

Definitions

1. noun

A symbol ∇ used to represent the gradient operator in vector calculus, or the musical instrument also known as the tar or the oud.

“The math student was trying to understand how to apply the nabla operator to the given equation.”

2. noun

A Middle Eastern stringed musical instrument, similar to a lute, used in Arabic and Persian music.

“The musician began to play the melodic tune on her nabla, creating a soothing atmosphere.”