Nabla

Nabla is a triangular symbol depicted as an inverted Greek delta. Identified by its downward-pointing apex, it belongs to the Mathematical Operators block of the Common script. The name derives from the Phoenician and Greek words for a harp, reflecting its harp-like silhouette. In academic and scientific contexts, this character is most frequently read as del or nabla.

Practitioners utilize this symbol extensively in multivariable calculus and physics to represent vector differential operators. Specifically, it appears in equations to denote the gradient of a scalar field, the divergence of a vector field, or the curl of a function. Beyond pure mathematics, engineers often use it in fluid dynamics and electromagnetism to describe spatial changes in physical properties like temperature or pressure.