U+2207 "∇" Nabla Unicode Character

U+2207 "∇" Nabla is a mathematical symbol that resembles an upside-down capital Greek letter delta and is primarily used in vector calculus to represent the del or nabla operator. This operator denotes a vector of partial derivatives and is fundamental in expressing key operations such as gradient, divergence, and curl. For instance, when applied to a scalar field, ∇f yields the gradient vector indicating the direction of greatest increase, while the dot product ∇·F gives the divergence of a vector field, and the cross product ∇×F defines its curl. The symbol's name comes from the Greek word for a harp, which its shape is said to resemble, and it was introduced by the mathematician William Rowan Hamilton in the 19th century.