Plural of 'del,' a mathematical symbol (∇) used in calculus to represent gradient operations and directional changes in functions.
Short form of 'delta' or 'nabla,' borrowed from the inverted Greek letter that resembles the symbol. Adopted in mathematics during the 19th century for compact notation.
Physicists and engineers use 'del' thousands of times daily—it's how they describe things like temperature changes in a room or how pressure varies in fluids, making it one of the most practically useful symbols in all of science.
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